RFE: Migrate datadog-service to cp-connector/go-sdk

[vadasambar]

Problem statement.
datadog-service uses the distributor sidecar for intercepting events from the shipyard-controller. Using distributor creates a problem where

• you can't use local development tools like Telepresence or you need to find a workaround
• you need to run another sidecar with your service (for example, this makes it harder to look at logs from both the services at the same time)

Describe the solution you'd like
Whatever distributor is doing right now should go inside datadog-service i.e., we replace the sidecar with a library which does the same thing as the distributor. We can use the cp-connector library or go-sdk in place of distributor

Describe alternatives you've considered
I haven't considered any other alternatives which don't use a sidecar.

Additional context

TODO

• PoC and see if we can use cp-connector or go-sdk in place of distributor (tests should pass; check this for how to run tests)
• Create an issue to try it out with local development tools like Telepresence (so that we can add docs around it in our README)
• If the PoC works fine, raise a PR to migrate datadog-service to go-sdk or cp-connector