fix(cdevents-webhooks) : Adding support for Artifact Constraints and Parameters using CDEvents data

[rjalander]

This PR has the changes to pass the CDEvents data to the Echo service, to validate the CDEvents data and run the pipeline executions with Artifact Constraints and Parameters.

Dependent PR : spinnaker/echo#1357

[spinnakerbot]

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[jasonmcintosh]

Couple of concerns:

• No tests - ideally a minimal test on this would be ideal
• Headers... I understand that may be the way CDEvents stuff is coming in, but we KNOW headers can be MASSIVE in size so shoving what sounds like raw data in an HTTP Header seems... problematic. This seems like a problem WITH The CDEvents APIs/libraries off hand. Not sure if there's a better way to handle this?
• Headers I THINK can be null so that "get(0)" could through an NPE. I could be wrong on this one...

[rjalander]

Couple of concerns:

• No tests - ideally a minimal test on this would be ideal
• Headers... I understand that may be the way CDEvents stuff is coming in, but we KNOW headers can be MASSIVE in size so shoving what sounds like raw data in an HTTP Header seems... problematic. This seems like a problem WITH The CDEvents APIs/libraries off hand. Not sure if there's a better way to handle this?
• Headers I THINK can be null so that "get(0)" could through an NPE. I could be wrong on this one...

There is an existing test for this endpoint to test with SUCCESS and BAD_REQUEST validations.

The headers are mandatory when sending CloudEvent as per required-attributes, but I can also get these from the cdevent object itself, like cdevent.getId(), cdevent.getSpecVersion(), cdevent.getType(), cdevent.getSource() to avoid get(0)

[rjalander]

@jasonmcintosh Can you please merge this if there are no other comments. Thank you.