Add package resources version fallback

[banesullivan]

Fixes an issue where our typical methods of uncovering a version fail for some packages by falling back to package-resoources if available to get the distribution version.

There may be justification for making this the default, but for now, I have tagged it on as a final fallback.

One particular package that needs this is pythreejs.

Main:

$ scooby pythreejs

--------------------------------------------------------------------------------

...

  Python 3.9.13 (main, Aug 25 2022, 18:24:45)  [Clang 12.0.0 ]

         pythreejs : Version unknown

This branch

$ scooby pythreejs

--------------------------------------------------------------------------------

...

  Python 3.9.13 (main, Aug 25 2022, 18:24:45)  [Clang 12.0.0 ]

         pythreejs : 2.4.1

[banesullivan]

@prisae, I assume we won't ever update this package?

The changes in this PR make it tough to not get a version for a package pkg_resources will get the distribution version which has to be set afaik

[prisae]

I am absolutely not sure I like this. So that package has no version. That is the whole point of that package. So scooby should not print "0.1.0", because it is simply wrong.

[prisae]

OK, pip does assign it by default 0.1.0. That is nothing I did, so I would not "update" the version number, it does not has one. Pip gives it.

If the package would not be installed, but in the python path, then scooby would still return Version unknown (hence scooby.report.VERSION_NOT_FOUND), so I think we should test that.

[codecov-commenter]

Codecov Report

Merging #101 (bfe4560) into main (5150815) will decrease coverage by 0.03%.
The diff coverage is 84.61%.

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
- Coverage   85.61%   85.58%   -0.03%     
==========================================
  Files           5        5              
  Lines         424      437      +13     
==========================================
+ Hits          363      374      +11     
- Misses         61       63       +2     

[banesullivan]

Pre-commit runs fine for me locally. I really need (want) this change, so I'm merging and releasing.

These changes render much of the knowledge.py module useless as we don't need version attributes or version setting methods and can just rely on pkg_resources. I'm going to PATCH release to get these changes in then, if I make time, will have a MINOR release to remove unneeded features