Upgrade protomaps leaflet and remove mvt imagery provider

[nf-s]

Upgrade protomaps leaflet

Fixes

• Fix protomaps-leaflet (MVT) vertex limit #7240
• Figure out our future usage of protomaps.js - now called protomaps-leaflet #6858

To be merged into #6725

Todo

• Finish copying json style to lib/Map/Vector/MapboxJsonStyleToProtomaps.ts
• Fix feature picking on load (for share links)

To test

This PR shouldn't impact usage of region mapping or MapboxVectorTileCatalogItem - so here are some examples to compare

MVT with simple Mapbox style spec

• http://ci.terria.io/main/#share=s-kMGzeYzE1ymufQMkJ0rcdJ3FUdL&clean&https://gist.githubusercontent.com/nf-s/a232b3f39eca70e3cf727cbca259ee0c/raw/7e9113e2135d41fb4162efb19c707cef15c252ba/esri-mvt.json
• http://ci.terria.io/upgrade-protomaps-leaflet/#share=s-kMGzeYzE1ymufQMkJ0rcdJ3FUdL&clean&https://gist.githubusercontent.com/nf-s/a232b3f39eca70e3cf727cbca259ee0c/raw/7e9113e2135d41fb4162efb19c707cef15c252ba/esri-mvt.json

Region mapping (with picked feature)

• http://ci.terria.io/main/#share=s-umjL4Q2NW2FQ4UYYOENMeR9iMtp&configUrl=https://terria-catalogs-public.storage.googleapis.com/pacificmap/map-config/prod.json
• http://ci.terria.io/upgrade-protomaps-leaflet/#share=s-umjL4Q2NW2FQ4UYYOENMeR9iMtp&configUrl=https://terria-catalogs-public.storage.googleapis.com/pacificmap/map-config/prod.json

[CLAassistant]

All committers have signed the CLA.

[na9da]

@nf-s Looks great, I have made a few minor comments.

[nf-s]

Thanks for the suggestions, I have applied requested changes. This is ready for another review, thanks!

[na9da]

Looks good @nf-s. I leave it to you to merge.