fix(code-gen): allow 'optional' order by for deletedAt column

[dirkdev98]

Accidentally added the 'deletedAt' field to the exception list. That exception exists because the internal 'createdAt' & 'updatedAt' will never be 'NULL', so allowing 'ASC NULL LAST' doesn't have any effect on the output.

Also made the options named, which may result in a smaller validator output.

Removed the 'ASC NULLS LAST' & 'DESC NULLS FIRST' as they are the defaults for 'ASC' and 'DESC'

[github-actions]

==== Benchmark result ====

Node.js version: 14
Total benchmarks: 15
          Passed: 15
          Failed: 0
-----------
router - github static path              200000  iterations    7137  ns/op
router - github path params              200000  iterations    9172  ns/op
compas validator simple                 5000000  iterations     226  ns/op
yup validator simple                     100000  iterations   10825  ns/op
fastest-validator validator simple     20000000  iterations      95  ns/op
compas validator nested                 1000000  iterations    1214  ns/op
yup validator nested                      50000  iterations   39380  ns/op
fastest-validator validator nested      5000000  iterations     472  ns/op
logger - strings                         500000  iterations    2297  ns/op
logger - objects                         500000  iterations    2908  ns/op
logger - deep objects                    500000  iterations    5235  ns/op
uuid                                    5000000  iterations     429  ns/op
uuid.isValid                           10000000  iterations     119  ns/op
isNil                                 500000000  iterations       0  ns/op
isPlainObject                         100000000  iterations      16  ns/op

[github-actions]

==== C8 test coverage ====
Statements: 67.18% ( 27963/41627 )
Branches : 63.89% ( 2981 /4666 )
Functions : 68.07% ( 923 /1356 )
Lines : 67.18% ( 27963 /41627 )

[github-actions]

==== Benchmark result ====

Node.js version: 15
Total benchmarks: 15
          Passed: 15
          Failed: 0
-----------
router - github static path              200000  iterations    8422  ns/op
router - github path params              200000  iterations   10027  ns/op
compas validator simple                 5000000  iterations     248  ns/op
yup validator simple                     100000  iterations   11183  ns/op
fastest-validator validator simple     20000000  iterations      93  ns/op
compas validator nested                 1000000  iterations    1366  ns/op
yup validator nested                      50000  iterations   41576  ns/op
fastest-validator validator nested      5000000  iterations     501  ns/op
logger - strings                         500000  iterations    2475  ns/op
logger - objects                         500000  iterations    3056  ns/op
logger - deep objects                    200000  iterations    5823  ns/op
uuid                                    5000000  iterations     361  ns/op
uuid.isValid                           10000000  iterations     130  ns/op
isNil                                 500000000  iterations       0  ns/op
isPlainObject                         100000000  iterations      18  ns/op

[github-actions]

==== Benchmark result ====

Node.js version: 14
Total benchmarks: 15
          Passed: 15
          Failed: 0
-----------
router - github static path              200000  iterations    8725  ns/op
router - github path params              100000  iterations   10330  ns/op
compas validator simple                 5000000  iterations     251  ns/op
yup validator simple                     100000  iterations   11945  ns/op
fastest-validator validator simple     10000000  iterations     105  ns/op
compas validator nested                 1000000  iterations    1439  ns/op
yup validator nested                      50000  iterations   44727  ns/op
fastest-validator validator nested      2000000  iterations     544  ns/op
logger - strings                         500000  iterations    2593  ns/op
logger - objects                         500000  iterations    3191  ns/op
logger - deep objects                    200000  iterations    5626  ns/op
uuid                                    2000000  iterations     511  ns/op
uuid.isValid                           10000000  iterations     132  ns/op
isNil                                 500000000  iterations       0  ns/op
isPlainObject                         100000000  iterations      18  ns/op

[github-actions]

==== C8 test coverage ====
Statements: 67.21% ( 27978/41627 )
Branches : 63.83% ( 2975 /4661 )
Functions : 68.73% ( 923 /1343 )
Lines : 67.21% ( 27978 /41627 )

[github-actions]

==== Benchmark result ====

Node.js version: 15
Total benchmarks: 15
          Passed: 15
          Failed: 0
-----------
router - github static path              200000  iterations    8763  ns/op
router - github path params              200000  iterations   10024  ns/op
compas validator simple                 5000000  iterations     261  ns/op
yup validator simple                     100000  iterations   12088  ns/op
fastest-validator validator simple     10000000  iterations     120  ns/op
compas validator nested                 1000000  iterations    1495  ns/op
yup validator nested                      50000  iterations   38274  ns/op
fastest-validator validator nested      2000000  iterations     538  ns/op
logger - strings                         500000  iterations    2729  ns/op
logger - objects                         500000  iterations    3284  ns/op
logger - deep objects                    500000  iterations    4769  ns/op
uuid                                    5000000  iterations     368  ns/op
uuid.isValid                           10000000  iterations     162  ns/op
isNil                                 500000000  iterations       0  ns/op
isPlainObject                         100000000  iterations      20  ns/op