Expose privilege API client to spaces

[eokoneyo]

Summary

Expose privilege API client to be injected into the spaces app, to facilitate new spaces UX

[elasticmachine]

Pinging @elastic/kibana-security (Team:Security)

[eokoneyo]

@elasticmachine merge upstream

[eokoneyo]

@elasticmachine merge upstream

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: ffef237

Failed CI Steps

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
security	523	526	+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
@kbn/security-plugin-types-public	25	31	+6

Async chunks

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

id	before	after	diff
security	589.4KB	588.6KB	-752.0B

Page load bundle

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

id	before	after	diff
security	66.6KB	67.3KB	+705.0B
spaces	29.4KB	29.6KB	+264.0B
total			+969.0B

Unknown metric groups

API count

id	before	after	diff
@kbn/security-plugin-types-public	51	58	+7
security	447	448	+1
total			+8

async chunk count

id	before	after	diff
security	22	21	-1

History

• 💚 Build #229525 succeeded 40b4b1f0f644b7915663affb8418261a1d8521c9
• 💔 Build #229475 failed b1f8f2467f447455705d5758397e89cd226c6f1d
• 💔 Build #229424 failed 71f09010ee1c5519d2411ca7ee4640ed4a9c603f
• 💔 Build #229411 failed f28b39f7c5e6696f4909d655b79870c7039eb631
• 💔 Build #229383 failed 6e0f0ad3b70c3d30933dcdb81052595df32d1c48
• 💔 Build #229364 failed 7b663108149cdcab9488153f16ae6792fc134b10

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

cc @eokoneyo