[7.x] [Expressions] Create expressions function to get UI settings (#101317)

[dokmic]

Backports the following commits to 7.x:

• [Expressions] Create expressions function to get UI settings ([Expressions] Create expressions function to get UI settings #101317)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 0b43085
• Storybooks Preview
• Documentation Changes

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
expressions	151	156	+5

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
expressions	1444	1467	+23

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
expressions	199.2KB	202.1KB	+2.9KB

Unknown metric groups

API count

id	before	after	diff
expressions	1871	1894	+23

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@elasticmachine merge upstream