Set up Options/Config CRD for KLT with OTel collector URL

[mowies]

Goal

Set up a configuration CRD like is done in the PoC and use it to give users the option to set the OTel collector URL.

Technical Details

• Make sure to add the CRD with the kubebuilder CLI and then copy over the code. This way, all auto-generation by kubebuilder will happen correctly
• watch for Expose KeptnMetrics as OTel metrics #607 and maybe also add a feature flag for the metrics server
• add controller logic from the PoC

References

PoC: #580
Kubebuilder book on how to add a new API: https://book.kubebuilder.io/cronjob-tutorial/new-api.html