feat: publish to callback endpoint for tracking

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 65.23077% with 113 lines in your changes missing coverage. Please review.

Project coverage is 56.82%. Comparing base (f69d830) to head (928bdfc).

Files	Patch %	Lines
pkg/shared/callback/callback.go	68.42%	24 Missing and 12 partials :warning:
pkg/isb/serde.go	51.11%	10 Missing and 12 partials :warning:
pkg/sources/forward/data_forward.go	66.66%	8 Missing and 2 partials :warning:
pkg/sources/http/http.go	0.00%	6 Missing :warning:
pkg/udf/forward/options.go	0.00%	5 Missing :warning:
pkg/sinks/forward/options.go	0.00%	4 Missing :warning:
pkg/sources/forward/options.go	0.00%	4 Missing :warning:
pkg/sources/transformer/grpc_transformer.go	60.00%	4 Missing :warning:
pkg/udf/rpc/grpc_map.go	60.00%	4 Missing :warning:
pkg/udf/rpc/grpc_mapstream.go	60.00%	4 Missing :warning:
... and 7 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1753 +/- ## ========================================== + Coverage 56.63% 56.82% +0.19% ========================================== Files 216 218 +2 Lines 17350 17581 +231 ========================================== + Hits 9826 9991 +165 - Misses 6692 6735 +43 - Partials 832 855 +23 ```

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