Financial Address Mapper - Modifications - Callback Config & Resolve API

[lalithkota]

As a continuation of #804, I have raised two PRs.
One regarding Callback configuration and Resolve API.
And one regarding enabling resolution with FA in resolve API.

Kindly take a look.

• Callback Url Configuration. Resolve API reorganize. g2p-mapper-registry#2
• Resolve API: Added ability to resolve using FA. g2p-mapper-registry#3

Thanks