feat: add final and declare strict types options

paul-thebaud commented 2 years ago

🚨Please review the guidelines for contributing to this repository.

[x] Make sure you are requesting to pull a feature/fix branch (right side). Don't request your master!
[x] Check the commit's or even all commits' message styles matches our requested structure.
[x] Check your code additions will fail neither code linting checks nor unit test.

Resolves #19 by providing two new config options:

testClassFinal (defaults to true): Tells if the test class should be final.
testClassStrictTypes (defaults to false): Tells if the test class should declare strict types.

This is a breaking change (new option and config interface change), so it should be released on a new major release.