feat: Add MsgRegisterService to handle service registration

The commit message for these changes would be:

feat: Add MsgRegisterService to handle service registration

This commit adds a new message type `MsgRegisterService` to the DID module's transaction proto file. This message allows users to register a new service with a given permission scope and origin URI. The domain must have a valid TXT record containing the public key.

The changes include:

- Adding the `MsgRegisterService` message type with fields for authority, origin URI, and scopes
- Adding the `MsgRegisterServiceResponse` message type to handle the response
- Updating the Msg service to include a new `RegisterService` RPC method
- Implementing the `RegisterService` method in the keeper

This feature allows users to register new services on the DID chain, which is an important part of the overall DID functionality.

client/go.mod

@@ -0,0 +1,3 @@
+module client
+
+go 1.22.0