Add precompile support for updating metadata key

[MiroslavGatsanoga]

HIP-657 introduced new metadata key that can be updated with TokenUpdate transaction. We need to add that ability in precompiles such as update token info and update token keys as well.

[quiet-node]

Hello @MiroslavGatsanoga, did this HIP fully implemented on the network? I just tried creating a token with a metadata_key but it doesn't seem to work. Or maybe I did something wrong

[MiroslavGatsanoga]

Hello @MiroslavGatsanoga, did this HIP fully implemented on the network? I just tried creating a token with a metadata_key but it doesn't seem to work.

@quiet-node I think the HIP is implemented on HAPI level but currently not in the system precompiles, so if you tried creating the token using them that might be the cause.