test_unbound_args: add a functionality to ignore specific methods

[arnaud-ma]

With this PR, it is now possible to ignore some methods, given their signature. For example, taking the false positive in #86:

module abcd

f(::NTuple{N, T}) where {N,T} = (N,T)
f(::Tuple{}) = (0,Any)

end # module

It is possible to disable the false positive with:

Aqua.test_unbound_args(abcd, ignore = [(abcd.f, NTuple)])

This specific example has been added in the unit tests.

To improve flexibility, the possibility to call directly Aqua.test_unbound_args(unbounds_args) where unbounds_args is a collection of methods (probably got with Test.detect_unbound_args) is also added.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.47%. Comparing base (1fca5d9) to head (a9f275a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #316      +/-   ##
==========================================
- Coverage   74.90%   74.47%   -0.43%     
==========================================
  Files          11       11              
  Lines         761      768       +7     
==========================================
+ Hits          570      572       +2     
- Misses        191      196       +5     

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