glandais / elevation / 17899710778

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feat: add Node.js support with environment-specific implementations

- Implement cross-platform support for both Browser and Node.js environments
- Create Tile abstraction layer with environment-specific implementations:
  - BrowserTileFetcher: Uses native browser APIs (Canvas, fetch, ImageBitmap)
  - NodeJsTileFetcher: Uses canvas package for Node.js compatibility
- Add dynamic module loading based on __NODE__ build flag
- Separate build targets for browser (ES, UMD, IIFE) and Node.js (ES, CommonJS)
- Lazy initialization of cache to support async module imports
- Merge ElevationDecoder functionality directly into Tile implementations
- Add optional Node.js dependencies: canvas, node-fetch, abort-controller

BREAKING CHANGE: Removed clearCache() method from public API - cache is now managed
internally with LRU eviction only

BREAKING CHANGE: Removed timeout parameter from ElevationProviderConfig - timeout
handling is now environment-specific

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