Specialize Index for literal indices with LitIndex #2140

Job	Run time
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / compile project with mill	3m 20s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / ci	14m 49s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / Benchmarking Sanity Check	2m 32s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / Formatting	1m 27s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / Integration Tests	9m 32s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / Standard Library Tests (2.13.14)	1m 36s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / Build Mdoc & Website	6m 21s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / Test Scala-CLI Example / Build and Test	2m 43s
check tests	1s
all tests passed	1s
Deploy Website	0s
publish	0s
	42m 22s

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