feat(): add if-validator

[develite98]

Hi, ifValidator or ifAsyncValidator are simple utility functions for help to simplify change dynamically validation of Angular Reactive Form.

[nartc]

A couple of nits.

Can you add some tests (either unit tests or e2e tests using the test-app)?

[develite98]

A couple of nits.

Can you add some tests (either unit tests or e2e tests using the test-app)?

Hello, @nartc I've already fixed comments and added e2e testing, but as I'm not experienced with it (e2e), could you help me check it?

[nartc]

Test looks good enough

[nartc]

@all-contributors please add @develite98 for code

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[allcontributors]

@nartc

I've put up a pull request to add @develite98! 🎉