* pmtiles js v4: remove pmtiles spec v2 compatibility [#287]
* restructure ts files into src
* add tsup for building ESM/CJS and making types work in ESM
* bump fflate dependency
* update CHANGELOG for js 4.0.0
* Remove prefetch boolean from JS sources - no reason to ever not use it
* JS optimization for header fetches on etag invalidation [#90]
* If promises are shared between requests, only the first invalidation makes the header request.
* If promises are not shared, simply delete the key.
* JS 3.0.3 [#90]
* update CHANGELOG
* Simplifies ETag logic into Source, making if-match conditional requests possible.
* Avoid if-match in FetchSource for latency reasons - use cache buster on ETag change
* handle weak ETags correctly
* add mock fetch server for testing ETags [#90]
* Typing improvements [#287]
* rename FileApiSource to FileSource
* In a few cases we need to use any and biome-ignore. Deferring any restructuring here to js v4.
* replace prettier with biome
* Some HTTP servers will return 206 Partial Content with an ETag for the contents, not the entire resource.
* This change allows the client to continue with mismatched ETags if this case is detected.
