get_root_link/get_child_links/get_item_links: Ensure correct media types

[jsignell]

Related Issue(s):

• closes get_child_links/get_item_links: Ensure correct media type #1255
• closes Root link parsing is not filtering based on media types #1325

Description:

• Allow media_type on get_links and get_single_link to an iterable
• Use application/json", "application/geo+json" or None as the media_type for get_root_link, get_child_linksandget_item_links`

PR Checklist:

• Pre-commit hooks and tests pass (run scripts/test)
• Documentation has been updated to reflect changes, if applicable
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.47%. Comparing base (c033b51) to head (de8c63c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1497   +/-   ##
=======================================
  Coverage   91.46%   91.47%           
=======================================
  Files          54       54           
  Lines        7511     7518    +7     
  Branches      907      909    +2     
=======================================
+ Hits         6870     6877    +7     
  Misses        457      457           
  Partials      184      184           

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[gadomski]

Needs CHANGELOG as well as one DRY option.