brotli-decompress received binary websocket messages

[gefjon]

Description of Changes

Uses brotli.js to decompress incoming binary messages before Protobuf deserializing.

API

• This is an API breaking change to the SDK

If the API is breaking, please state below what will break

Requires SpacetimeDB PRs

• Binary WebSocket API: Brotli-compress all outgoing messages SpacetimeDB#1026

[RReverser]

Let's switch to brotli-dec-wasm instead, should be faster & smaller (1.5 MB for brotli.js vs 350KB for brotli-dec-wasm).

[RReverser]

That way we'll be able to get rid of extra Buffer dependency too, which really shouldn't be necessary on the Web.

[gefjon]

@RReverser 's version would have been better, but it turns out that making it work across different platforms (incl. the test platform) is a pain. We'll merge this now, and make improvements later.

[RReverser]

I was also wrong about 1.5MB - because you imported /decompress submodule directly, it's closer to 500KB, so it's not as bad as the entire module looked.

But yeah we'll revisit in future.

[bfops]

"LGTM"; this doesn't seem to have much surface area besides obviously-needed.

[kazimuth]

Yeah, LGTM.