feat: add a new operator for self-hosted certificate management

[RealAnna]

This PR:

1. adds a new operator with a single controller
2. the controller will be watching deployments of the lifecycle toolkit
3. the controller will check webhooks configuraitons, to create needed certificates

NOTES: the actual implementation logic of the secrets will be in an other pr, this is also why there are not many tests here, most of the code of this pr is autogenerated with kubebuilder :)

[codecov]

Codecov Report

Merging #523 (2ac3bf7) into main (deb1027) will increase coverage by 1.44%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #523      +/-   ##
==========================================
+ Coverage   48.50%   49.94%   +1.44%     
==========================================
  Files          60       60              
  Lines        5443     5528      +85     
==========================================
+ Hits         2640     2761     +121     
+ Misses       2692     2660      -32     
+ Partials      111      107       -4     

Impacted Files	Coverage Δ
operator/controllers/keptnapp/controller.go	68.42% <0.00%> (-9.23%)	⬇️
operator/webhooks/pod_mutating_webhook.go	35.83% <0.00%> (-0.11%)	⬇️
operator/api/v1alpha2/keptnapp_types.go	91.66% <0.00%> (ø)
...ator/api/v1alpha2/keptnevaluationprovider_types.go	100.00% <0.00%> (ø)
operator/api/v1alpha2/keptnappversion_types.go	97.52% <0.00%> (+0.41%)	⬆️
...erator/api/v1alpha2/keptnworkloadinstance_types.go	91.62% <0.00%> (+0.85%)	⬆️
...or/controllers/keptnworkloadinstance/controller.go	79.08% <0.00%> (+1.76%)	⬆️
...ptnworkloadinstance/reconcile_prepostevaluation.go	90.90% <0.00%> (+9.09%)	⬆️
...keptnworkloadinstance/reconcile_deploymentstate.go	85.24% <0.00%> (+22.95%)	⬆️
scheduler/pkg/klcpermit/workflow_manager.go	52.22% <0.00%> (+40.98%)	⬆️

Flag	Coverage Δ
component-tests	50.43% <ø> (-0.46%)	⬇️
keptn-lifecycle-operator	47.85% <ø> (+0.78%)	⬆️
scheduler	21.17% <ø> (+16.64%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

[mowies]

isn't the kubebuilder PROJECT file missing here?

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication

[bacherfl]

lgtm