[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

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1. [MySQL] REST Stored Procedure Support #660
   enhancement mysql +2