[receiver/googlecloudpubsub] Add support for Encoding Extensions

[alexvanboxel]

Component(s)

receiver/googlecloudpubsub

Is your feature request related to a problem? Please describe.

The receiver currently supports some build in encodings. The goal is to separate the encodings out of the receiver and put them in their own extension. Before this can happen, the receiver needs to support Encoding Extensions.

Describe the solution you'd like

Reuse the encoding field in the configuration file to select the Encoding Extensions. If non is defined, fall back to the build in encoders.

Describe alternatives you've considered

No response

Additional context

After this change, the cloud_logging encoding will be extracted from the receiver.

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Pinging code owners:

• receiver/googlecloudpubsub: @alexvanboxel

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[VihasMakwana]

@alexvanboxel Thanks for opening this request!

Would you also contribute a PR for this?