Streamline giving ids to TreeArena methods #1982

Job	Run time
cargo check (aarch64-android)	24s
cargo clippy (windows-latest)	29s
cargo check (msrv) (wasm32)	22s
cargo check (msrv) (windows-latest)	1m 59s
cargo clippy (macos-latest)	28s
cargo check (msrv) (macos-latest)	40s
cargo clippy (ubuntu-latest)	32s
cargo check (msrv) (ubuntu-latest)	36s
cargo clippy (wasm32)	1m 20s
cargo doc	1m 22s
formatting	29s
cargo test (wasm32)	23s
Prime LFS Cache	3s
typos	4s
cargo test (windows-latest)	2m 55s
cargo test (macos-latest)	1m 52s
cargo test (ubuntu-latest)	4m 23s
	18m 21s

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