[Known Issue] Add support for MySQL Stored-Procedure

[abhishekkumams]

DAB currently supports Executing Stored-procedure for GraphQL/REST for MS-SQL, We need to extend this support to MYSQL as well.

doc: https://github.com/Azure/data-api-builder/blob/main/docs/internals/StoredProcedureDesignDoc.md
mssql PR: #979

### Tasks
- [ ] https://github.com/Azure/data-api-builder/issues/660