Add API source to tracking data

[jdpgrailsdev]

What

• Track source of API requests in Segment
• fix airbytehq/airbyte-internal-issues#1344

How

• Check if the current HTTP request contains the API source header. If so, add it to the tracked data

Recommended reading order

1. SegmentTrackingClient.java

Tests

• Added unit test to verify behavior
• All other tests pass
• Project builds locally

[github-actions]

Airbyte Code Coverage

File	Coverage [81.99%]	🍏
SegmentTrackingClient.java	93.31%	🍏
CorsFilter.java	0%	❌

Total Project Coverage	24.53%	❌

[timroes]

The header will also be needed to added to the ACCESS_CONTROL_ALLOW_HEADERS headers in our CorsFilter, so we can send this header cross domain to the backend. This shouldn't be required for production strictly spoken, since we're usually run on the same domain, but during development we usually develop against a cloud backend, so it would be nice if we could have that header allowed for CORS.

[jdpgrailsdev]

ACCESS_CONTROL_ALLOW_HEADERS

@timroes The custom CorsFilter will go away once we convert Airbyte Cloud's wrapped server to Micronaut. I will add the header to it for now so it works in the meantime.