Add support for pip specifier syntax like pywinrm[credssp]==0.4.3

[sbancal]

In our project we need to install the pywinrm package. As described on https://pypi.org/project/pywinrm/ , we have added it to requirements.txt with the following syntax:

pywinrm[credssp]==0.4.3

When we run ansible-builder build, we see that this line has been simplified to:

pywinrm==0.4.3

which means that the requests-credssp dependency has been forgotten.

Browsing the ansible-builder's code a bit, we found that it's introspect.py's sanitize_requirements function that does this.

ansible-builder/src/ansible_builder/_target_scripts/introspect.py

Line 319 in 167ed5c

def sanitize_requirements(collection_py_reqs):

Would it be possible to add support for this standard pip syntax ?

[kurokobo]

This may be addressed by #664 since the syntax is in pep508.

[Shrews]

We expect this to be handled in the 3.1 release.