ERC-721 command not fully working

When I run chainbridge core example by
`./chainbridge-core-example evm-cli erc721 -h`
the only one command showing up is add minter.
Other commands such as approve, deposit... etc are not working.

I am not sure if this is not working because chainbridge core example is meant to test only erc20, but wanted to figure it out since I was trying this to transfer erc721.

## Versions
ChainBridge commit (or docker tag): Chainbridge core example v0.0.1
Go version: 1.17