Completely replace pkg_resources with importlib.resources

[mattmess1221]

Description

Resolves #307

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

All tests in pytest succeed

Checklist:

• My code follows the style guidelines of this project (no GitHub actions complaints! run make lint before
  committing!)
• I have commented my code, pydocstyle and darglint are happy, docstrings are in google docstring format, and all
  docstrings include a summary, args, returns and raises fields (even if N/A)
• I have added tests that prove my fix is effective or that my feature works, if adding "functional" tests please
  note if there are any considerations for the vrnetlab setup
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (bbb145a) 90.51% compared to head (84cf0da) 90.50%.

Files	Patch %	Lines
scrapli/helper.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #311      +/-   ##
==========================================
- Coverage   90.51%   90.50%   -0.01%     
==========================================
  Files          60       60              
  Lines        3488     3487       -1     
==========================================
- Hits         3157     3156       -1     
  Misses        331      331              

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[carlmontanari]

🔥 boom! thank you very much @killjoy1221 -- will merge when darlint ci is done (its slooooow, don't think this pr would have any issue there but ya know... just due diligence :))