Search api 1 cleanup

[SpacemanPaul]

Reason for this pull request

Take advantage of Python 3.10 type hint enhancements, and fix incorrect typehints.

• Tests added / passed
• Fully documented, including docs/about/whats_new.rst for all changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9585230) 85.43% compared to head (c44991b) 85.43%.

❗ Current head c44991b differs from pull request most recent head 7a8a29a. Consider uploading reports for the commit 7a8a29a to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##           develop-1.9    #1541   +/-   ##
============================================
  Coverage        85.43%   85.43%           
============================================
  Files              140      140           
  Lines            15044    15047    +3     
============================================
+ Hits             12853    12856    +3     
  Misses            2191     2191           

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[omad]

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