AST formatter/pretty-printer #3731

Job	Run time
Clippy	50s
rustfmt	18s
no-std (stable, wasm32-unknown-unknown)	59s
no-std (nightly, wasm32-unknown-unknown)	58s
Check Rust stable on ubuntu with --all-targets --no-default-features	1m 4s
Check Rust stable on ubuntu with --all-targets	1m 1s
Check Rust stable on ubuntu with --all-targets --all-features	1m 31s
Check Rust nightly on ubuntu with --all-targets --no-default-features	1m 18s
Check Rust nightly on ubuntu with --all-targets	58s
Check Rust nightly on ubuntu with --all-targets --all-features	1m 6s
Test Rust stable on ubuntu with --profile test-release	7m 52s
Test Rust stable on ubuntu with --profile test-release --doc	4m 6s
Test Rust nightly on ubuntu with --profile test-release	7m 53s
Test Rust nightly on ubuntu with --profile test-release --doc	4m 10s
Test Rust nightly on windows-2022	0s
	34m 4s

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