define KongLicense CRD

[randmonkey]

What this PR does / why we need it:

define KongLicense CRD for storing a Kong license and applying it to Kong gateway.

Which issue this PR fixes:

First step of #5437

Special notes for your reviewer:

Not finished yet, but the structure of the CRD is basically determined. Major uncertain parts:

• How to name the status of the KongLicense reconciled in each controller, parents or controllers? (controllers)
• Should we import types from gateway API, or define our own types? (define own types)
• Do we need a field to store the type of the controller? (defined a controllerName to identify controllers)
• Should we have Phase and what phases do we have? Pending -> Accepted -> Configured? (No Phase, but conditions)
• Should we add conditions and transition time between each step? (Ditto above)

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR

[czeslavo]

How to name the status of the KongLicense reconciled in each controller, parents or controllers?

I think that controllers is more precise, but I'm OK with parents as well.

Should we import types from gateway API, or define our own types?

I think we should not rely on Gateway API in this case as it's not a CRD that's somehow interconnected with this "world".

Do we need a field to store the type of the controller?

I think we don't as long as we keep the ControllerName unique between controllers/controllers' instances (as I wrote in the comment).

Should we have Phase and what phases do we have? Pending -> Accepted -> Configured?

I'd skip Phase for now and just use []metav1.Conditions which is more common and easy to extend.

Should we add conditions and transition time between each step?

Ditto.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f5ae15f) 69.7% compared to head (a8c9a7e) 69.8%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #5487   +/-   ##
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  Coverage   69.7%   69.8%           
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  Files        176     176           
  Lines      22857   22873   +16     
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+ Hits       15949   15982   +33     
+ Misses      5961    5948   -13     
+ Partials     947     943    -4     

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[tao12345666333]

fixed the lint error.