enable features needed by rustfmt to make build system happy and speedup build.
this is what rustc_workspace_hack does in the upstream build.
Gbp-Pq: Name d-0004-clippy-feature-sync.patch
itertools = "0.10.1"
quote = "1.0"
serde = { version = "1.0.125", features = ["derive"] }
-syn = { version = "1.0", features = ["full"] }
+syn = { version = "1.0", features = ["full", "visit"] }
futures = "0.3"
parking_lot = "0.12"
tokio = { version = "1", features = ["io-util"] }
log = "0.4"
regex = "1.5"
serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
+serde_json = { version = "1.0", features = ["unbounded_depth"] }
term = "0.7"
thiserror = "1.0"
toml = "0.5"