Implement V1 API for messaging.* resources.

[vaikas]

Problem
Add V1 api for messaging.*

As discussed today, we'll break the tasks down by the api group. This issue tracks the work for that. Also as discussed in the meeting, I offered to jot down some representative PRs that are necessary for the work, and hopefully will help folks doing the work:
Introduce types:
#2407

Defaulting webhook:
#2645

Conversions:
#2611
(but since the functions were renamed, so need to use these names):
#2632

That's a start, I might be missing something but figured I'd share some resources so folks can get started :)

[nlopezgi]

I'm taking a stab at helping with this one.

[matzew]

@nlopezgi do you need help, e.g. on doing conversion?

[nlopezgi]

@nlopezgi do you need help, e.g. on doing conversion?

Thanks @matzew , I think I'm pretty close to getting the conversion working correctly, I could not finish it last friday but I should be done with this very soon. Will holler if I need a hand.

[nlopezgi]

I think that with #3435 we should be done with this issue? Let me know if something is pending to work on it.

[matzew]

@nlopezgi I think so too. Do you mind creating an umbrella task like @aliok did #3411 ?

[matzew]

/close

[knative-prow-robot]

@matzew: Closing this issue.

In response to this:

/close

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[nlopezgi]

@nlopezgi I think so too. Do you mind creating an umbrella task like @aliok did #3411 ?

Created #3446, but I'm not planning on working on this task for the remainder of this week and likely next one. If this is of high priority lets sync to see what's the best strategy to get this landed in time.