Add authz and feegrant messages to default types

[webmaster128]

authz and feegrant were added to the code generator already. They add the new message types:

• cosmos.authz.v1beta1.MsgGrant
• cosmos.authz.v1beta1.MsgExec
• cosmos.authz.v1beta1.MsgRevoke
• cosmos.feegrant.v1beta1.MsgGrantAllowance
• cosmos.feegrant.v1beta1.MsgRevokeAllowance

They should be added to the Stargate registry.

For the AminoTypes it seems like no Amino JSON signing is implemented on-chain. So we should create a specific error message for that, explaining why it does not work.

[webmaster128]

This should make https://github.com/cosmos/composer/blob/master/react/src/redux/action-creator/wallet.ts#L59-L60 unnecessary.

[webmaster128]

Reopening because this part is missing:

we should create a specific error message for that, explaining why it does not work.

We should add an implementation to https://github.com/cosmos/cosmjs/blob/main/packages/stargate/src/aminotypes.ts#L67-L511 for the new message types where both toAmino and fromAmino are implemented by throwing this error: "This message type cannot be signed using the Amino JSON sign mode because this is not implemented on-chain."