Support state sync

[ethanfrey]

State sync will copy over the iavl store, but it has no idea of the contracts stored under data/wasm. This leads to the following error when querying a contract on a node that was state synced:

Error: Error calling the VM: Cache error: Error opening Wasm file for reading: No such file or directory (os error 2): query wasm contract failed: invalid request

Requires a solution to cosmos/cosmos-sdk#7340 before we can address this.

[ethanfrey]

Update - there seem to be a push from other chains as well and this is slated for a v0.43.x patch release

[ethanfrey]

This depends on cosmos sdk feature which is not yet implemented.

Will need at least Cosmos SDK 0.44 (#501 planned for v2).

Help is appreciated if anyone wants to add support for this to the cosmos sdk

[alpe]

fyi: Secret hat an implementation

[assafmo]

I'll send a PR soon

[ethanfrey]

Closed by #823