Dynamic import for @deck.gl

This allows users of this library who don't need the deck.gl layers to omit the dependencies, as originally intended.

Version upgrades

Upgraded to the final release of MapLibre GL v3. There were only minor fixes between the prerelease version I was using before and the final version, so you should not anticipate needing to update anything.

Svelte 4 has also been added to the peer dependency range. This library continues to work fine with Svelte 3.

v0.2.2

• Add transformRequest support to Map

Thanks to @jamesscottbrown for the PR!