Add TABLE OVERRIDE Feature for MaterializedMySQL Table Customization

Why it matters

This feature allows users to override the default schema mappings of MySQL tables when using the MaterializedMySQL engine. It solves the problem of rigid schema replication by enabling customizations, thus providing flexibility to adapt the table structures to specific needs or optimize performance.

How to use it

Users can apply the feature by specifying the TABLE OVERRIDE clause in the MaterializedMySQL setup configuration. This clause lets users define customized schema details for selected tables, overriding the automatic schema replication behavior.