A large part of the complexity in this commit comes from the fact that the newer crc library with the correct algorithm moves (instead of borrows) the digest when `finalize()` is called.

Clean up past comments and attempts

Uncommented part is the template that works

still needs cleanup

Everything past line 68 still needs to be updated/cleaned up

Missing a provided environment on the rust side. This approach has a method, but methods cannot be passed to wasm, since wasm doesn't have access to the struct in question. Follow this example instead: https://docs.wasmer.io/integrations/examples/host-functions