Expose `secp256k1` and `keccak256` in the SDK #3363

Job	Run time
check-git-rev-deps	7s
cargo-deny (advisories)	4m 21s
build-and-test (ubuntu-latest, x86_64-unknown-linux-gnu)	6m 4s
cargo-deny (bans licenses sources)	4m 15s
build-fuzz	1m 3s
build-and-test (ubuntu-latest, aarch64-unknown-linux-gnu, true)	3m 25s
build-and-test (macos-latest, x86_64-apple-darwin)	21m 58s
docs	3m 26s
fmt	11s
build-and-test (macos-latest, aarch64-apple-darwin)	16m 17s
publish-dry-run	0s
build-and-test (windows-latest, x86_64-pc-windows-msvc)	21m 0s
rust-analyzer-compat	9m 33s
complete	1s
	1h 31m 41s

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