API hints tweaks

[kecnry]

Description

This pull request is a follow-up to #3137 to give the flexibility for inherited plugins (i.e. time selector in lcviz or cube extraction in lcviz/rampviz) to override the plugin key shown in the API hints. It also makes the following small tweaks:

• fix the styling on a component in the slice plugin
• fix styling for "apply RGB presets" button in plot options
• fix options for "align_by" in orientation plugin to be the same options as the API
• add quotes around the color string in color picker

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]

see https://github.com/spacetelescope/lcviz/pull/133/files#diff-32e4b267e193d9c8832ff3c8b50929e8fc6f755b802f7dad26bd910cc22375cfR42 for how this will be used in lcviz to override the API hint to access the plugin from plugins['Slice'] to plugins['Time Selector'].

[bmorris3]

Looks surprising at first, but super simple in the end. Neat!

[bmorris3]

Thanks, this looks useful and sustainable.

[bmorris3]

Looks surprising at first, but super simple in the end. Neat!

[kecnry]

test failures unrelated and showing on other PRs as well, so I'm ignoring and merging since this PR doesn't touch any related logic.