feat: add option to skip arrow function for explicit function return …

[nazarhussain]

Summary

This PR introduce new option allowArrowFunctions to the lint/nursary/useExplicitFunctionReturnType rule.

In larger code base there are a lot of arrow functions used for a lot of inline functionality, mostly to overcome need of passing a function instead of a value. e.g. () => object.attr. Specifying explicit return type for such arrow functions is tedious to do and don't provide a of help, as the TS can infer the return type easily.

This option is similar to allowExpressions option for @typescript-eslint/explicit-function-return-type but not identical.

Test Plan

Tested manually by building binary and testing against a sample code.

Could not find a way to set custom option in the test-docs for specific rule, so could not add new test cases.

[ematipico]

@nazarhussain thank you for your contribution.

We would appreciate it if you'd get involved first with the relative issue: #2017

The issue was assigned to another contributor, which already implemented your use case: #4036

[Conaclos]

We recently renamed the rule to useExplicitTypes, you will have to update your code. Also, we should not add any options. We could just extend the rule.