Re-add IME support #2307

Job	Run time
cargo check (msrv) (windows-latest)	37s
cargo check (msrv) (wasm32)	22s
cargo clippy (windows-latest)	30s
cargo check (msrv) (macos-latest)	34s
cargo check (aarch64-android)	21s
cargo clippy (macos-latest)	33s
cargo check (msrv) (ubuntu-latest)	33s
cargo clippy (ubuntu-latest)	29s
cargo clippy (wasm32)	1m 49s
cargo doc	21s
formatting	32s
Prime LFS Cache	7s
cargo test (wasm32)	25s
typos	4s
cargo test (windows-latest)	1m 47s
cargo test (macos-latest)	42s
cargo test (ubuntu-latest)	1m 39s
	11m 25s

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