Add esri-gl, map-gl-offline, map-gl-style-switcher, and tilefeed

[muimsd]

Summary

• Add esri-gl to Clients — a module for using Esri services in Mapbox GL JS or MapLibre GL JS, an alternative to esri-leaflet for WebGL.
• Add map-gl-offline to Mapbox GL JS Plugins — a TypeScript package for MapLibre GL JS and Mapbox GL JS to enable offline tiles.
• Add map-gl-style-switcher to Mapbox GL JS Plugins — a customizable style switcher control for Mapbox GL JS and MapLibre GL JS.
• Add tilefeed to CLI Utilities — PostGIS vector tile pipeline that generates MBTiles via Tippecanoe with incremental updates via PostgreSQL LISTEN/NOTIFY.

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