[UnifiedFieldList] Add time series dimension as new type

[dej611]

Summary

PoC for #163323

Checklist

Delete any items that are not applicable to this PR.

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• Any UI touched in this PR is usable by keyboard only (learn more about keyboard accessibility)
• Any UI touched in this PR does not create any new axe failures (run axe in browser: FF, Chrome)
• If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list
• This renders correctly on smaller devices using a responsive layout. (You can test this in your browser)
• This was checked for cross-browser compatibility

Risk Matrix

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Before closing this PR, invite QA, stakeholders, and other developers to identify risks that should be tested prior to the change/feature release.

When forming the risk matrix, consider some of the following examples and how they may potentially impact the change:

Risk	Probability	Severity	Mitigation/Notes
Multiple Spaces—unexpected behavior in non-default Kibana Space.	Low	High	Integration tests will verify that all features are still supported in non-default Kibana Space and when user switches between spaces.
Multiple nodes—Elasticsearch polling might have race conditions when multiple Kibana nodes are polling for the same tasks.	High	Low	Tasks are idempotent, so executing them multiple times will not result in logical error, but will degrade performance. To test for this case we add plenty of unit tests around this logic and document manual testing procedure.
Code should gracefully handle cases when feature X or plugin Y are disabled.	Medium	High	Unit tests will verify that any feature flag or plugin combination still results in our service operational.
See more potential risk examples

For maintainers

• This was checked for breaking API changes and was labeled appropriately

[kibana-ci]

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• Commit: 64ce547
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Failed CI Steps

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Metrics [docs]

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
@kbn/unified-field-list	277	278	+1

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
aiops	594.8KB	595.6KB	+807.0B
apm	3.7MB	3.7MB	+807.0B
dataVisualizer	613.4KB	613.7KB	+257.0B
discover	565.9KB	567.2KB	+1.2KB
enterpriseSearch	2.6MB	2.6MB	+44.0B
eventAnnotationListing	197.3KB	197.6KB	+303.0B
graph	387.7KB	387.8KB	+44.0B
indexManagement	553.0KB	553.1KB	+44.0B
lens	1.4MB	1.4MB	+1.3KB
maps	2.8MB	2.8MB	+44.0B
ml	3.5MB	3.5MB	+851.0B
presentationUtil	74.4KB	74.5KB	+44.0B
securitySolution	12.8MB	12.8MB	+44.0B
stackAlerts	202.8KB	202.8KB	+44.0B
unifiedDocViewer	57.6KB	57.9KB	+303.0B
unifiedSearch	215.2KB	215.2KB	+44.0B
total			+6.1KB

Page load bundle

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

id	before	after	diff
osquery	51.2KB	51.3KB	+44.0B

Unknown metric groups

API count

id	before	after	diff
@kbn/unified-field-list	304	305	+1

History

• 💔 Build #163492 failed 133c514
• 💔 Build #148233 failed 74ba2c1

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @dej611