Add schema name for the junction table of many-to-many relationship

[baolequoc]

Summary

• Add schema name for the junction table:

Ref schema.table1.column1 <> schema.table2.column2 → will create a junction table: "schema"."table1_table2"
Ref schema1.table1.column1 <> schema2.table2.column2 → will create a junction table "schema1"."table1_table2"

Issue

(issue link here)

Lasting Changes (Technical)

• Add schema name for buildTableManyToMany
• Add schema name for buildForeignKeyManyToMany
• Add new test for many to many relationships

Checklist

Please check directly on the box once each of these are done

• [ ] Documentation (if necessary)
• [x] Tests (integration test/unit test)
• [ ] Integration Tests Passed
• [ ] Code Review