Adds __int__() and __float__() functions to Quantity.

[rbeyer]

Related Issue

Would close #91

How Has This Been Tested?

• make lint
• make docs
• make test-all

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Licensing:

This project is released under the LICENSE.

• I claim copyrights on my contributions in this pull request, and I provide those contributions via this pull request under the same license terms that the pvl project uses.

[codecov[bot]]

Codecov Report

Merging #92 (6951910) into main (4f3b28e) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #92   +/-   ##
=======================================
  Coverage   94.84%   94.85%           
=======================================
  Files          12       12           
  Lines        1922     1925    +3     
=======================================
+ Hits         1823     1826    +3     
  Misses         99       99           

Impacted Files	Coverage Δ
pvl/collections.py	98.71% <100.00%> (+0.01%)	:arrow_up:

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