[Logs UI][Metrics UI] Lazy load alert types

[afgomez]

Summary

Part of #89025. Lazy load alert types on plugin initialization to reduce the size of the infra bundle.

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 72b0e3c

Metrics [docs]

Async chunks

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

id	before	after	diff
infra	1.9MB	2.1MB	+160.4KB

Page load bundle

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

id	before	after	diff
infra	190.1KB	114.3KB	-75.8KB

Unknown metric groups

async chunk count

id	before	after	diff
infra	14	20	+6

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

[afgomez]

Closing since we are not going to merge it. It was a good experiment to see what's possible with lazy loading, but I think we want to better understand how and what to lazy load.