Tenant level mapping rules

Overview
Currently the default mapping rules are stored along with the code. Few libraries have different requirements to change the how the default rules are present. Use mod-configuration to store tenant specific overrides.
Implementation:
If config is present in mod-configuration use that to create the rules. If not use default rules

Acceptance Criteria

• Config is stored in mod-configuration
• default mapping rules are loaded by default to the table
• unit tests are written
• API tests are written