Display warning about license match percentage

[ForgottenProgramme]

Fixes #303 (partly)

Grayskull uses rapidfuzz to do the matching between the package license and a set of standard licenses stored in grayskull/license/data.
I have added a warning to inform the user about how close the 'License Type' (as mentioned in the recipe and displayed in the console) is to the actual license found in the package metadata.
As mentioned in the linked issue and as discussed with @marcelotrevisani, the next step should be to add a comment about the match percentage within the recipe.

[codecov-commenter]

Codecov Report

Merging #305 (78e0344) into main (9c3242e) will increase coverage by 0.25%.
The diff coverage is 93.77%.

❗ Current head 78e0344 differs from pull request most recent head d80e823. Consider uploading reports for the commit d80e823 to get more accurate results

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
+ Coverage   91.30%   91.56%   +0.25%     
==========================================
  Files          17       16       -1     
  Lines        1576     1517      -59     
==========================================
- Hits         1439     1389      -50     
+ Misses        137      128       -9     

Flag	Coverage Δ
unittests	91.56% <93.77%> (+0.25%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
setup.py	0.00% <0.00%> (ø)
grayskull/license/discovery.py	95.67% <54.54%> (-1.47%)	⬇️
grayskull/strategy/abstract_strategy.py	83.33% <83.33%> (ø)
grayskull/utils.py	89.67% <86.08%> (-10.33%)	⬇️
grayskull/base/github.py	88.67% <88.67%> (ø)
grayskull/__main__.py	95.29% <92.10%> (-2.86%)	⬇️
grayskull/base/factory.py	91.17% <93.33%> (+1.17%)	⬆️
grayskull/strategy/py_base.py	95.45% <95.45%> (ø)
grayskull/config.py	96.66% <96.66%> (ø)
grayskull/strategy/pypi.py	98.72% <98.72%> (ø)
... and 7 more

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[marcelotrevisani]

Cool! Thanks a lot for your contribution again! :)
🚀🚀🚀