Re-add IME support #2298

Job	Run time
formatting	29s
cargo clippy (wasm32)	1m 59s
cargo check (msrv) (wasm32)	18s
cargo check (aarch64-android)	22s
cargo check (msrv) (windows-latest)	2m 27s
cargo clippy (windows-latest)	4m 47s
cargo check (msrv) (macos-latest)	50s
cargo clippy (macos-latest)	2m 31s
Prime LFS Cache	8s
cargo check (msrv) (ubuntu-latest)	45s
cargo clippy (ubuntu-latest)	3m 25s
cargo test (wasm32)	24s
cargo doc	41s
typos	6s
cargo test (windows-latest)	4m 20s
cargo test (macos-latest)	1m 53s
cargo test (ubuntu-latest)	4m 21s
	29m 46s

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