feat: Create sink-connectors repo and add atleast one sink with one abstraction

[gauravsinghania]

Context: As a first task, we want to create a repo which will hold the sink-connector library. This library will be used by both firehose and dagger. it might be private in the beginning until completed.

Acceptance criteria:

• Define the abstraction for the interfaces.

• Implement influx db sink as a common library, as it is part of both firehose and dagger and it does not require batching in dagger side in the current implementation.

• the library should provide way to plug in instrumentation for both firehose and dagger.

Out of scope:

Implementation of a sink on dagger and/or firehose. We will do it in the next ticket.