BREAKING | Simplify classes

[alejandrohdezma]

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🚀 What's included in this PR?

📦 Use attributes for storing auth context on AuthedRoutesSuite

Instead of having to parametrize everything with ContextRequest. Although this change is in fact a breaking change, it shouldn't have much effect on most codebases, since adding the context has been implemented into the Request#context extend method.

🔥 Simplify hierarchy

The type parameter in Http4sSuite has been removed, since we can just use Request everywhere. This also allows to directly implement http4sMUnitNameCreator, test and http4sMUnitFunFixture at the top level.

New methods have been created for providing the fixture running the tests, as well as a new class representing test-names creator.

The Http4sMUnitTestCreator has been extracted to its own class.