Add support for nested CSS in ts, js and tsx #3591

Job	Run time
Check Linux Packaging	1m 58s
Test Linux (latest stable Rust)	1m 53s
Test with MIME database	1m 57s
Output Regression Test	2m 33s
Test aarch64-pc-windows-msvc	2m 27s
Test x86_64-pc-windows-msvc	2m 25s
Test x86_64-unknown-linux-gnu	2m 9s
Test aarch64-unknown-linux-gnu	3m 29s
Rustfmt	18s
Test x86_64-unknown-linux-musl	2m 54s
Actionlint	13s
Test aarch64-apple-darwin	2m 8s
Test x86_64-apple-darwin	6m 11s
Typo Check	10s
	30m 45s

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