Implement opusdecoder with wasm-opus-decoder

[chicco-carone]

This pull request includes significant updates to the src/snapstream.ts file and minor updates to the package.json file. The main focus is on integrating the opus-decoder library and enhancing the OpusDecoder class to support asynchronous decoding.

Integration of opus-decoder library:

• package.json: Added opus-decoder to dependencies.
• src/snapstream.ts: Imported OpusDecoder from opus-decoder.

Enhancements to OpusDecoder class:

• src/snapstream.ts: Re-implemented OpusDecoder class to initialize the WebAssembly-based Opus decoder and support asynchronous decoding.
• src/snapstream.ts: Updated SnapStream class to handle the new asynchronous decode method of OpusDecoder.

Removal of deprecated code:

• src/snapstream.ts: Removed the old OpusDecoder class implementation.

[badaix]

Great, thanks a lot @chicco-carone! Works like a charm :)
And thanks for your patience, my seven month old daughter is keeping me very busy :)

[chicco-carone]

No problem take care of yourself and thanks for this amazing piece of software.
Btw you should probably update the readme removing this from the issues.