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

Generate correct legends for doc-data:

Generate correct style-rules for agg data:

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

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)

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