provide alternative rust-mode that derives from rust-ts-mode #222

Job	Run time
test (ubuntu-latest, 26.3, false)	38s
test (ubuntu-latest, 27.2, false)	37s
test (ubuntu-latest, 28.2, false)	32s
test (ubuntu-latest, 29.1, false)	31s
test (macos-latest, 26.3, false)	1m 46s
test (macos-latest, 27.2, false)	1m 43s
test (macos-latest, 28.2, false)	1m 41s
test (macos-latest, 29.1, false)	1m 52s
test (windows-latest, 26.3, false)	1m 56s
test (windows-latest, 27.2, false)	51s
test (windows-latest, 28.2, false)	53s
test (windows-latest, 29.1, false)	1m 33s
test (ubuntu-latest, snapshot, true)	37s
test (macos-latest, snapshot, true)	1m 33s
test (windows-latest, snapshot, true)	1m 7s
	17m 50s

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