Add intelligence to the assert rule to reduce results on test files

[ericwb]

Is your feature request related to a problem? Please describe.
The assert rule shows lots of results if it happens to scan a directory designed for unit tests, especially if using PyTest.

Describe the solution you'd like
Add more intelligence to the assert rule such that it inspects the scope to know if the assert is within a class of pattern "Test" or "Test", or alternatively in a function "test_".

And ideally there should be a way to configure these default settings. So a parent feature might be to implement an extensive configuration mechanism.

Describe alternatives you've considered
n/a

Additional context
n/a

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