Feat: zkvm target for the ruint library #8

Job	Run time
Clippy	50s
Docs	1m 3s
Cargo deny check	24s
Feature checks	23s
Fmt	11s
test (stable, --no-default-features)	52s
test (stable)	56s
test (stable, --all-features)	2m 9s
test (beta, --no-default-features)	1m 5s
test (beta)	1m 4s
test (beta, --all-features)	2m 12s
test (nightly, --no-default-features)	56s
test (nightly)	57s
test (nightly, --all-features)	2m 6s
test (1.65, --no-default-features)	23s
test (1.65)	17s
Accept	1s
	15m 49s

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