Add link to filehandler and its associated test

[aerorahul]

Description
This PR:

• adds the ability to link files via FileHandler
• adds associated test for link.
• removes older python version tests as they are deprecated in the GH runner.

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

• pynorms
• pytests

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes need updates to the documentation. I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing tests pass with my changes
• Any dependent changes have been merged and published

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.18%. Comparing base (3ea5acd) to head (f9af333).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #48      +/-   ##
===========================================
+ Coverage    52.79%   53.18%   +0.39%     
===========================================
  Files           18       18              
  Lines         1680     1694      +14     
  Branches       296      300       +4     
===========================================
+ Hits           887      901      +14     
  Misses         743      743              
  Partials        50       50              

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[CoryMartin-NOAA]

One comment, otherwise I think this is fine