[Maps] Auto generate legends and styles from mvt data

[thomasneirynck]

Closes #76549, #92672 (for ES-data)

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Generate correct legends for doc-data:

Generate correct style-rules for agg data:

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This PR also removes the edge-case where the "get-from-data-switch" could be disabled. This only arose (before this PR) when mvt-backed ES-data (such as avg, min, max-aggs) was used for by-value styling. The style-meta could be retrieved only by a back-end call to ES for extended stats. This split is no longer needed, since the tiles contain the metadata as well. This client-side determination can now be made as well.

ie. the toggle now works for all ES-data, regardless of scaling-type

e.g.: using extended-stats:

e.g.: using tile-meta

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This adds tile metadata inside the mvt so the map can correctly bootstrap style and legend information.

on the server-side:

Add a metadata-feature to the mvt responses containing information about:

• whether the tile shows complete data
• how many features are inside a tile
• what shape-types are inside a tile
• domain of the values inside the tile for agg-data

on the client-side:

• legend-icon can now be correctly generated
  • adjust icon based on shape-type
  • show appropriate tooltip content
  • show incomplete-results icon
  • show no-results icon
• layer can now autogenerate color-ramps for countable data (counts/sums-aggs)

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Other improvement can be extracted to other PRs:

• show bounds of tile outline with incomplete results rather than ugly no-data tile
• select initial color based on middle of color-ramp

[nreese]

@elasticmachine merge upstream

[nreese]

LGTM getting style meta for tiles is a huge achievement. Thanks for making all the changes to handle both categorical and ordinal styles and making the code changes clean.

Just one minor nit about where to put some if logic that you can take or leave.

[kibanamachine]

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Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
maps	740	742	+2

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
maps	200	203	+3

Async chunks

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

id	before	after	diff
maps	3.1MB	3.1MB	+6.3KB

Page load bundle

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

id	before	after	diff
maps	64.6KB	65.0KB	+457.0B

Unknown metric groups

API count

id	before	after	diff
maps	201	204	+3

History

• 💚 Build #136864 succeeded 778775e
• 💔 Build #136822 failed 83a728b
• 💚 Build #136495 succeeded bbd1403
• 💔 Build #136070 failed 35a5b60
• 💔 Build #135978 failed 4ad1ae7

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@elasticmachine merge upstream

[kibanamachine]

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