bpo-36898: Add parameter @case_sensitive to glob and rglob in pathlib

[monchin]

In pathlib, I add a parameter case_sensitive to glob and rglob.

Sometimes the extension would be in upper case but sometimes it would be lower case, for example: *.tif and *.TIF. So the parameter case_sensitive may be useful in some cases.

Usage example:

In [1]: from pathlib import Path

In [2]: path = Path('.')

In [3]: for each_file in path.glob('*.tif'):
   ...:     print(each_file)
   ...:     
a.tif
b.tif

In [4]: for each_file in path.rglob('*.TIF'):
   ...:     print(each_file)
   ...:     
c.TIF
TEST/d.TIF

In [5]: for each_file in path.glob('*.TIF', case_sensitive=False):
   ...:     print(each_file)
   ...:     
a.tif
c.TIF
b.tif

In [6]: for each_file in path.rglob('*.TIF', case_sensitive=False):
   ...:     print(each_file)
   ...:     
a.tif
c.TIF
b.tif
TEST/d.TIF
TEST/e.tif

https://bugs.python.org/issue36898

[the-knights-who-say-ni]

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[eamanu]

I think that this is a good improve.

You need to write tests and NEW file.

Don't forget sign the CLA :-)

[brettcannon]

Thanks for the PR, but closing as the CLA has not been signed within the last month. If you do decide to sign the CLA we can re-open this PR.