Add supported commands in server capabilities #29411

Job	Run time
Determine changes	9s
pre-commit	37s
mkdocs	2m 39s
cargo fmt	19s
python package	1m 19s
cargo build (msrv)	2m 59s
cargo build (release)	4m 1s
cargo clippy	1m 33s
benchmarks	4m 3s
cargo fuzz	5m 24s
cargo shear	22s
cargo test (linux)	3m 26s
cargo test (wasm)	1m 3s
cargo test (windows)	5m 49s
formatter instabilities and black similarity	0s
test scripts	57s
ecosystem	9m 30s
test ruff-lsp	23s
Fuzz the parser	0s
	44m 33s

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