fix(cargo): update TOML syntax and add arrow-ipc to ignore list

- Changed `ignored = "serde_json"` to `ignored = ["serde_json"]` to comply with TOML array requirements.
- Fixed additional TOML parse errors.
- Added `arrow-ipc` to the `cargo-machete` ignore list with a comment on its necessity for spill compression codec support.

Author: kosiew

datafusion-cli/Cargo.toml

@@ -85,4 +85,4 @@ serde_json = { workspace = true, features = ["preserve_order"] }
 # Required because we pull serde_json with a feature to get consistent pg display,
 # but its not directly used.
 [package.metadata.cargo-machete]
-ignored = "serde_json"
+ignored = ["serde_json"]

datafusion/physical-plan/Cargo.toml

@@ -94,6 +94,10 @@ tokio = { workspace = true, features = [
     "parking_lot",
 ] }
 
+# Required for spill compression codec support (see comment on arrow-ipc dependency above).
+[package.metadata.cargo-machete]
+ignored = ["arrow-ipc"]
+
 [[bench]]
 harness = false
 name = "partial_ordering"

datafusion/sqllogictest/Cargo.toml

@@ -97,4 +97,4 @@ path = "bin/sqllogictests.rs"
 # Required because we pull serde_json with a feature to get consistent pg display,
 # but its not directly used.
 [package.metadata.cargo-machete]
-ignored = "serde_json"
+ignored = ["serde_json"]