Histogram bin size and limits

[javerbukh]

Description

This pull request is to address point 3 in this comment #2097 (comment)
Before:

After:

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.

Add option to set bin size in plot options plugin and API call to change histogram viewer limits. [#2309]

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.
• After merge, any internal documentations need updating (e.g., JIRA, Innerspace)?

[codecov]

Codecov Report

Patch coverage: 97.43% and project coverage change: +0.01% 🎉

Comparison is base (0b268b9) 90.97% compared to head (6125155) 90.99%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2309      +/-   ##
==========================================
+ Coverage   90.97%   90.99%   +0.01%     
==========================================
  Files         152      152              
  Lines       17282    17316      +34     
==========================================
+ Hits        15723    15756      +33     
- Misses       1559     1560       +1     

Files Changed	Coverage Δ
...nfigs/default/plugins/plot_options/plot_options.py	94.33% <96.42%> (+0.14%)	⬆️
...lt/plugins/plot_options/tests/test_plot_options.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[kecnry]

stretch_hist_nbins could be added to the user-API (and docstring) so its accessible from the plugin API.

[kecnry]

Just one small comment, but otherwise looks good to me. Once merged, I'll open the PR to refactor the histogram to use the re-usable plugin component. Thanks!

[duytnguyendtn]

Behaves as expected; thanks!