code-gen: add file validator support

[dirkdev98]

We can now validate files in a few places where we previously we could only check if it was available:

• isBrowser api input
• isBrowser api output
• !isBrowser api client input
• !isBrowser api response
• !isBrowser route validators via router

Closes #645

[github-actions]

==== Benchmark result ====

Node.js version: 14
Total benchmarks: 15
          Passed: 15
          Failed: 0
-----------
router - github static path              200000  iterations    6490  ns/op
router - github path params              200000  iterations    8641  ns/op
compas validator simple                 5000000  iterations     217  ns/op
yup validator simple                     100000  iterations   10299  ns/op
fastest-validator validator simple     20000000  iterations      95  ns/op
compas validator nested                 1000000  iterations    1115  ns/op
yup validator nested                      50000  iterations   31761  ns/op
fastest-validator validator nested      5000000  iterations     460  ns/op
logger - strings                         500000  iterations    2432  ns/op
logger - objects                         500000  iterations    2910  ns/op
logger - deep objects                    500000  iterations    4177  ns/op
uuid                                    5000000  iterations     423  ns/op
uuid.isValid                           10000000  iterations     140  ns/op
isNil                                 500000000  iterations       0  ns/op
isPlainObject                         100000000  iterations      17  ns/op

[github-actions]

==== Benchmark result ====

Node.js version: 15
Total benchmarks: 15
          Passed: 15
          Failed: 0
-----------
router - github static path              200000  iterations    6767  ns/op
router - github path params              200000  iterations    8145  ns/op
compas validator simple                 5000000  iterations     207  ns/op
yup validator simple                     100000  iterations   10155  ns/op
fastest-validator validator simple     20000000  iterations      98  ns/op
compas validator nested                 1000000  iterations    1195  ns/op
yup validator nested                      50000  iterations   32200  ns/op
fastest-validator validator nested      5000000  iterations     459  ns/op
logger - strings                         500000  iterations    2336  ns/op
logger - objects                         500000  iterations    2856  ns/op
logger - deep objects                    500000  iterations    4101  ns/op
uuid                                    5000000  iterations     329  ns/op
uuid.isValid                           10000000  iterations     134  ns/op
isNil                                 500000000  iterations       0  ns/op
isPlainObject                         100000000  iterations      17  ns/op

[github-actions]

==== C8 test coverage ====
Statements: 66.41% ( 24588/37024 )
Branches : 65.26% ( 2714 /4159 )
Functions : 66.86% ( 825 /1234 )
Lines : 66.41% ( 24588 /37024 )