Remove storage and testing crates

[ljedrz]

This PR removes the storage and testing crates (they reside in snarkOS now), making snarkVM free of the dependency on rocksdb and greatly speeding up its compilation time. The tests that depend on snarkos-testing and snarkos-storage reside in a new snarkos-integration crate, which is not a member of the snarkVM workspace.

In order to run the aforementioned tests, the CI needs to be adjusted so that snarkos-integration tests have their own dedicated run; the associated image should also contain the necessary parameters, otherwise they take a while to download.

note: since the snarkos crates need to be aligned with the current snarkVM APIs, the snarkOS repository linked in Cargo.toml within snarkos-integration currently points to a branch associated with https://github.com/AleoHQ/snarkOS/pull/677. This can be changed once that PR is merged (to a fresh AleoHQ/snarkOS commit) or to a released version once it's released.

[ljedrz]

another note: Cargo.lock in snarkos-integration might be unnecessary - it can be removed if desired.

[howardwu]

note to self: TODO - change the snarkOS dependencies to the next release in snarkos-integration/Cargo.toml