feat(processor): allow public construction of vm state iterator #4944

Job	Run time
rustfmt	14s
no-std (stable, wasm32-unknown-unknown)	1m 25s
Clippy	1m 12s
Check Rust stable on ubuntu with --all-targets --no-default-features	1m 10s
no-std (nightly, wasm32-unknown-unknown)	1m 29s
Check Rust stable on ubuntu with --all-targets	1m 15s
Test Rust stable on ubuntu with --profile test-release	10m 2s
Test Rust nightly on windows-2022	0s
Check Rust stable on ubuntu with --all-targets --all-features	1m 13s
Test Rust stable on ubuntu with --profile test-release --doc	5m 54s
Check Rust nightly on ubuntu with --all-targets --no-default-features	1m 13s
Test Rust nightly on ubuntu with --profile test-release	11m 21s
Check Rust nightly on ubuntu with --all-targets	1m 17s
Test Rust nightly on ubuntu with --profile test-release --doc	6m 22s
Check Rust nightly on ubuntu with --all-targets --all-features	1m 14s
	45m 21s

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