[7.x] [canvas] New Home Page (#102446)

[kibanamachine]

Backports the following commits to 7.x:

• [canvas] New Home Page ([canvas] New Home Page #102446)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: e0e34d5
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
canvas	1089	1114	+25

Async chunks

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

id	before	after	diff
canvas	1.3MB	1.3MB	+10.4KB

Page load bundle

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

id	before	after	diff
canvas	530.2KB	519.9KB	-10.3KB

Unknown metric groups

async chunk count

id	before	after	diff
canvas	8	10	+2

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

cc @clintandrewhall