code-gen: error when JS keywords are used as group names

[dirkdev98]

I made the same mistake twice already. The backend generators don't mind it at all, but in the react-query generator, we also dump a useApi() and something like the following is not allowed:

const { static } = useApi();

Closes #636

[github-actions]

==== C8 test coverage ====
Statements: 66.18% ( 24498/37019 )
Branches : 65.44% ( 2685 /4103 )
Functions : 65.93% ( 811 /1230 )
Lines : 66.18% ( 24498 /37019 )

[github-actions]

==== Benchmark result ====

Node.js version: 14
Total benchmarks: 15
          Passed: 15
          Failed: 0
-----------
router - github static path              200000  iterations    9684  ns/op
router - github path params              100000  iterations   11756  ns/op
compas validator simple                 5000000  iterations     278  ns/op
yup validator simple                     100000  iterations   13083  ns/op
fastest-validator validator simple     10000000  iterations     109  ns/op
compas validator nested                 1000000  iterations    1452  ns/op
yup validator nested                      50000  iterations   47888  ns/op
fastest-validator validator nested      2000000  iterations     587  ns/op
logger - strings                         500000  iterations    2881  ns/op
logger - objects                         500000  iterations    3479  ns/op
logger - deep objects                    500000  iterations    6340  ns/op
uuid                                    2000000  iterations     538  ns/op
uuid.isValid                           10000000  iterations     154  ns/op
isNil                                 500000000  iterations       0  ns/op
isPlainObject                          50000000  iterations      21  ns/op

[github-actions]

==== Benchmark result ====

Node.js version: 15
Total benchmarks: 15
          Passed: 15
          Failed: 0
-----------
router - github static path              100000  iterations   11595  ns/op
router - github path params              100000  iterations   13739  ns/op
compas validator simple                 5000000  iterations     287  ns/op
yup validator simple                     100000  iterations   14233  ns/op
fastest-validator validator simple     10000000  iterations     133  ns/op
compas validator nested                 1000000  iterations    1626  ns/op
yup validator nested                      50000  iterations   52998  ns/op
fastest-validator validator nested      2000000  iterations     600  ns/op
logger - strings                         500000  iterations    2937  ns/op
logger - objects                         500000  iterations    3491  ns/op
logger - deep objects                    200000  iterations    6119  ns/op
uuid                                    5000000  iterations     439  ns/op
uuid.isValid                           10000000  iterations     163  ns/op
isNil                                 500000000  iterations       0  ns/op
isPlainObject                          50000000  iterations      23  ns/op