Support gzip-compressed JSON-RPC request bodies

Please add support for gzip-compressed inbound JSON-RPC request bodies sent with the Content-Encoding: gzip header.

Currently, the compressed body reaches the JSON-RPC parser without being decompressed and returns -32600 Invalid json request, while the identical uncompressed request succeeds.

Expected behavior: the RPC edge should decompress the request body before JSON parsing. This would reduce upload bandwidth for large JSON-RPC and batch request payloads. Response compression through Accept-Encoding already works and is separate from this request.