zetacored : add validate for authorization list when validating authority genesis state

[kingpinXD]

• Add Validation for in GenesisState.Validate()
• It is okay to not validate during migration as we are using a hardcoded list and can be certain that the binary is not tampered with before distribution
  The Default value is already being tested here
  https://github.com/zeta-chain/zeta-node/blob/eb462fad938f7f5f908dbbf4c8f73523b0950c89/x/authority/types/authorization_list_test.go#L236-L240