Attribute Macro andr_exec

#[andr_exec]

Attaches all relevant ADO messages to a set of Execute messages for a given contract.

Also derives the AsRefStr trait for the enum allowing the use of as_ref_str to get the string representation of the enum variant.

e.g. ExecuteMsg::MyMessage{..}.as_ref_str() will return "MyMessage"

Must be placed before #[cw_serde]