feat: new deckgl and maplibre plugins

[birkskyum]

Closes #30307

Summary

Implements SIP-130 — migrate map visualizations from proprietary Mapbox GL to open-source MapLibre GL JS.

Two new plugins:

• preset-chart-deckgl — All 11 deck.gl chart types on deck.gl 9 + MapLibre (keys: deck_*_maplibre)
• plugin-chart-maplibre — Scatter/cluster chart replacing legacy MapBox (key: maplibre)

Legacy plugins unchanged — existing dashboards keep working with original keys (deck_arc, deck_scatter, etc.).

They follow the new plugin style and will be the successors of the:

• legacy-preset-chart-deckgl
• legacy-plugin-chart-map-box

Changes

Frontend

• New plugins use react-map-gl v8 + MapboxOverlay/useControl pattern (replaces v6 StaticMap)
• Free map tiles by default (OpenFreeMap Liberty, Carto) — no API token needed
• Map style configurable via Customize tab with freeForm URL support
• Legacy deck.gl charts renamed to "(Legacy Mapbox)" in chart picker
• Both presets registered side-by-side in MainPreset.ts

Backend

• viz.py: MapLibreViz + 11 Deck*Maplibre viz subclasses
• config.py: CSP connect-src simplified to https: for tile provider flexibility

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

A new feature:

Ability to runtime set the map style, by selecting from drop down or by inserting a url:

Requested #30307 (comment) by @StarkillerGDN.

The styles requested have to be whitelisted here:

• https://github.com/apache/superset/pull/38035/changes#diff-c99ae4b2b09b756ab2189a99a9685229f9d12633fc2616c368ea869770f603bf

TESTING INSTRUCTIONS

• Chart picker shows both legacy "(Legacy Mapbox)" and new MapLibre variants
• New deck.gl charts render tiles, layers, tooltips, and autozoom
• MapLibre scatter chart renders dots, clusters, and supports custom tile URLs
• Legacy charts on existing dashboards still work
• No CSP errors in browser console

ADDITIONAL INFORMATION

• Has associated issue: Tracking Issue: Migrating from Mapbox to MapLibre [Approved SIP-130] #30307
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API - Adds new chart types (new MapLibre and new DeckGL types, but keep all existing)
• Removes existing feature or API

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.62%. Comparing base (5a777c0) to head (7538f3d).

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #38035       +/-   ##
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+ Coverage        0   66.62%   +66.62%     
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  Files           0      671      +671     
  Lines           0    51729    +51729     
  Branches        0     5792     +5792     
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+ Hits            0    34462    +34462     
- Misses          0    15876    +15876     
- Partials        0     1391     +1391     

Flag	Coverage Δ
hive	41.47% <ø> (?)
mysql	64.54% <ø> (?)
postgres	64.62% <ø> (?)
presto	41.48% <ø> (?)
python	66.41% <ø> (?)
sqlite	64.21% <ø> (?)
superset-extensions-cli	96.49% <ø> (?)
unit	100.00% <ø> (?)

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