Customizable prefix for cloudevent extensions

[cchayka-campsci]

Proposed Changes

• allow the CloudEvent extension attributes "partition" and "offset" to have a customizable prefix

As brought up before in this issue #3992, a previous version of NodeJS cloudevents would throw an error for any extension > 20 chars in length.

We are in a tough position to update this package for a large number of legacy services, so we were hoping you could consider a change like this for versions 1.14 and onward.

The code I have changed here is incomplete, but I wanted to check if this change would be allowable first.

Basically just adding a new env var "CE_METADATA_EXTENSION_PREFIX" to change the "knativekafka" part of the "knativekafkapartition" and "knativekafkaoffset" CE extensions.

Release Note

:broom: allow customization of the prefix of the CE extensions

Docs

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[knative-prow]

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[knative-prow]

Welcome @cchayka-campsci! It looks like this is your first PR to knative-extensions/eventing-kafka-broker 🎉

[knative-prow]

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