[7.x] Sharing saved objects phase 3.5 (#100424)

[kibanamachine]

Backports the following commits to 7.x:

• Sharing saved objects phase 3.5 (Sharing saved objects phase 3.5 #100424)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: bf624b1
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
savedObjectsManagement	78	79	+1
spaces	249	251	+2
total			+3

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
core	1055	1056	+1

Async chunks

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

id	before	after	diff
ml	5.9MB	5.9MB	+9.0B
savedObjectsManagement	138.9KB	141.9KB	+3.0KB
spaces	272.8KB	279.8KB	+6.9KB
total			+10.0KB

Page load bundle

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

id	before	after	diff
core	417.3KB	417.8KB	+531.0B
spaces	41.7KB	42.4KB	+712.0B
total			+1.2KB

Saved Objects .kibana field count

Every field in each saved object type adds overhead to Elasticsearch. Kibana needs to keep the total field count below Elasticsearch's default limit of 1000 fields. Only specify field mappings for the fields you wish to search on or query. See https://www.elastic.co/guide/en/kibana/master/development-plugin-saved-objects.html#_mappings

id	before	after	diff
legacy-url-alias	4	5	+1

Unknown metric groups

API count

id	before	after	diff
core	2284	2296	+12
spaces	96	106	+10
spacesOss	71	72	+1
total			+23

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

cc @jportner