Allow HTTP POST requests to use compression

[jdetter]

We've recently discovered that there's a post body maximum size of 2MB. We'd like to increase this value, but there are some security implications to doing this: https://docs.rs/axum/latest/axum/extract/index.html#request-body-limits

So, another way we can allow users to invoke reducers with large parameters would be to use compression. Since these are calls over the HTTP interface and not through websockets we care less about performance so we could go with something that yields a higher compression ratio.

[Lethalchip]

Rate limiting calls over the HTTP API could also be a valid alternative. It would reduce the risk associated with increasing the max DefaultBodyLimit.

[P1YU5H-50N1]

I believe brotli will be a good choice for payload compression as it provides good compression ratio and processing time than other available choices. Can I contribute to this issue ?