Merge all of porch's go modules into a single go module

[kispaljr]

Currently porch consists of three separate go modules:

• the "root" module that contains primarily the porch server
• the controllers module that contains the packagevariant* controllers
• the api module that contains (some of the) porch api definitions in the form of go structs

These modules depend on each other, and that makes it really hard to introduce changes that touches multiple modules.
This PR aims to put all of the above into one singular porch go module to make the lives of developers considerably easier.

[kispaljr]

This is still work-in-progress. I will remove the hold label when it is ready for review.

[kispaljr]

/retest

[kispaljr]

/retest

[kispaljr]

/retest

[kispaljr]

/retest

[kispaljr]

/retest

[kispaljr]

@efiacor , @liamfallon this is ready for review now

[efiacor]

Looks great. I'm fully in favour of this approach but could this cause other potential issue that I don't have the golang knowledge to foresee?

[efiacor]

No longer needed?

[efiacor]

Also, I didn't fully check but we need to ensure that the code-gen stuff is still sound.

[kispaljr]

Also, I didn't fully check but we need to ensure that the code-gen stuff is still sound.

I can only state that make generate runs without errors on my machine.

[efiacor]

/approve

[kispaljr]

Also, after we merge this, we will have to adjust the go.mod files in the Nephio project. (But first, we have to merge this, so that a commit hash is assigned to the new single module)

[liamfallon]

I downloaded this PR and it built fine for me

Thanks @kispaljr for this, it'll really help

/approve
/lgtm

[nephio-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: efiacor, kispaljr, liamfallon

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