UI-searchable API methods/attributes

[kecnry]

Description

This pull request implements plugin-tray filtering of plugins by their exposed methods/attributes. (Note that this also helps expose to us places where we expose args/kwargs that probably shouldn't be exposed and should work to clean those up 🐱)

Screen.Recording.2025-01-09.at.11.35.59.AM.mov

Note that currently this filtering still happens when API hints are off (so "Plot Options" still appears for a search of "RGB"), but that could easily be changed if preferred.

Change log entry

• Is a change log needed? If yes, is it added to CHANGES.rst? If you want to avoid merge conflicts,
  list the proposed change log here for review and add to CHANGES.rst before merge. If no, maintainer
  should add a no-changelog-entry-needed label.

Checklist for package maintainer(s)

This checklist is meant to remind the package maintainer(s) who will review this pull request of some common things to look for. This list is not exhaustive.

• Are two approvals required? Branch protection rule does not check for the second approval. If a second approval is not necessary, please apply the trivial label.
• Do the proposed changes actually accomplish desired goals? Also manually run the affected example notebooks, if necessary.
• Do the proposed changes follow the STScI Style Guides?
• Are tests added/updated as required? If so, do they follow the STScI Style Guides?
• Are docs added/updated as required? If so, do they follow the STScI Style Guides?
• Did the CI pass? If not, are the failures related?
• Is a milestone set? Set this to bugfix milestone if this is a bug fix and needs to be released ASAP; otherwise, set this to the next major release milestone. Bugfix milestone also needs an accompanying backport label.
• After merge, any internal documentations need updating (e.g., JIRA, Innerspace)?

[kecnry]

Tests won't pass due to deprecated methods until rebased on #3385. In the future, if we have more deprecated plugin methods, we'll either have to manually exclude them from this list or filter the deprecation warning when building the list.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.05%. Comparing base (ae2aae8) to head (66f0914).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3384      +/-   ##
==========================================
+ Coverage   88.03%   88.05%   +0.01%     
==========================================
  Files         127      127              
  Lines       19722    19729       +7     
==========================================
+ Hits        17363    17372       +9     
+ Misses       2359     2357       -2     

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[pllim]

Demo was cool. Thanks!