refactor: reorganize RPC modules into unified structure

Cargo.lock

@@ -3631,6 +3631,7 @@ dependencies = [
  "criterion",
  "flatbuffers 25.2.10",
  "futures",
+ "futures-util",
  "glob",
  "hex-simd",
  "highway",
@@ -3664,6 +3665,7 @@ dependencies = [
  "s3s",
  "serde",
  "serde_json",
+ "serde_urlencoded",
  "sha2 0.10.9",
  "shadow-rs",
  "siphasher 1.0.1",
@@ -8494,8 +8496,10 @@ dependencies = [
  "base64-simd",
  "blake3",
  "brotli 8.0.1",
+ "bytes",
  "crc32fast",
  "flate2",
+ "futures",
  "hex-simd",
  "highway",
  "lazy_static",
@@ -8517,6 +8521,7 @@ dependencies = [
  "tempfile",
  "tokio",
  "tracing",
+ "transform-stream",
  "url",
  "winapi",
  "zstd",