feat(s3select): add JSON handling and flattening for EcObjectStore (#1930)

Signed-off-by: 0xdx2 <xuedamon2@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: houseme <housemecn@gmail.com>

crates/s3select-api/Cargo.toml

@@ -38,6 +38,7 @@ http.workspace = true
 object_store = { workspace = true }
 pin-project-lite.workspace = true
 s3s.workspace = true
+serde_json = { workspace = true }
 snafu = { workspace = true, features = ["backtrace"] }
 parking_lot.workspace = true
 tokio.workspace = true