☂️ Replace `controller-manager-library` with `controller-runtime` 🏷️

[MartinWeindel]

What would you like to be added:
The dependency on the controller-manager-library should be replaced by the controller-runtime. As the controller-manager-library provides sophisticated declarative controller logic, command line configuration and many other features, this will be a larger rewrite of the overall application.

Why is this needed:
The controller-manager-library is deprecated and in maintenance mode. To simplify maintenance and to make the code more streamlined with other Gardener projects, the controller-runtime should be used instead. It will also allow new developers to understand the code faster as it follows the standard patterns as in Gardener.

Tasks

• Skeleton for new dns-controller-manager
• Support DNS queries on authoritative DNS servers
• Implement controller for DNSProvider in control plane
  • basic implementation
  • deal with switching DNS account
  • trigger reconciliation of related DNS entries on deletion
  • handle finalizer on provider secrets
  • tests More provider entry integration test cases #665
• Implement controller for DNSEntry [Controller-Runtime-Rewrite] Controller for DNSEntries #517
• Implement controller for DNSAnnotation [Controller-Runtime-Rewrite] Implement controller for DNSAnnotation #687
• Implement controller for DNSProvider in source cluster (shoot) [Controller-Runtime-Rewrite] Implement controller for DNSProvider replication #691
• Migrate provider types 🎉
  • mock
  • aws-route53 [Controller-Runtime-Rewrite] Add AWS Route53 handler #553
  • azure-dns [Controller-Runtime-Rewrite] Add handler for azure{-private}-dns #666
  • azure-privatedns [Controller-Runtime-Rewrite] Add handler for azure{-private}-dns #666
  • google-clouddns [Controller-Runtime-Rewrite] Add handler for google-cloud-dns #595
  • openstack-designate [Controller-Runtime-Rewrite] Add handler for openstack-designate #623
  • alicloud-dns [Controller-Runtime-Rewrite] Add handler for alicloud-dns #637
  • rfc2136 [Controller-Runtime-Rewrite] Add handler for rfc2136 #639
  • cloudflare-dns [Controller-Runtime-Rewrite] Add handler for cloudflare-dns #641
  • netlify [Controller-Runtime-Rewrite] Add handler for netlify-dns #643
  • infoblox ⚠️Infoblox will not be supported anymore, as there is no known stakeholder anymore and we have no test env
  • powerdns [Controller-Runtime-Rewrite] Add handler for powerdns #651
• Implement source controllers
  • Service [Controller-Runtime-Rewrite] Implement Service source controller #684
  • Ingress [Controller-Runtime-Rewrite] Implement Ingress source controller #739
  • DNSEntry [Controller-Runtime-Rewrite] DNSEntry source controller #746
  • Gateway (istio) [Controller-Runtime-Rewrite] Istio source controllers (WIP) #796
  • Gateway (k8s) [Controller-Runtime-Rewrite] Gateway API source controllers #779
• React on CRD changes for groups "gateway.networking.k8s.io" and "networking.istio.io"
  • gateway.networking.k8s.io [Controller-Runtime-Rewrite] Gateway API source controllers #779
  • networking.istio.io [Controller-Runtime-Rewrite] Istio source controllers (WIP) #796
• Extend build to create image for new dns-controller-manager-next-generation [Controller-Runtime-Rewrite] Build dns-controller-manager-next-generation image #697
• Extend gardener-extension-shoot-dns-service to optionally deploy dns-controller-manager-next-generation
  • Implement missing target labels: [Controller-Runtime-Rewrite] Support labels on target DNSEntries and DNSProviders #713
  • [Controller-Runtime-Rewrite] Prepare for deployment in control plane #722
  • Get full object on removing finalizer to avoid secret data loss #723
  • Allow to use next-generation dns-controller-manager per configuration in shoot manifest gardener-extension-shoot-dns-service#615
  • [Controller-Runtime-Rewrite] Set provider to Error if domain selection is empty #736
  • [Controller-Runtime-Rewrite] Fix ignore full behaviour #740
  • [Controller-Runtime-Rewrite] Event feedback for source resources #745
  • Support switching a seed to use the next-generation-controller Add label for seed to control usage of next-generation controller gardener-extension-shoot-dns-service#643
  • Investigate shoot deletion workflow as next-generation controller is also responsible for managing DNS record in the backend and controller must not be deleted to early. Especially the case with replicated DNSProviders and DNSEntries must be checked
• Miscellaneous
  • [Controller-Runtime-Rewrite] Provider reconciliation should set state to Error on invalid credentials #754
  • [Controller-Runtime-Rewrite] Add integration test case for dnsprovider-source controller #756