feat: add allowedPropagatingAPIs option for resource selection

[vasudev-bongale]

Changes

• Add --allowed-propagating-apis option to hub-agent command.
• Validate that --allowed-propagating-apis and --skipped-propagating-apis are mutually exclusive and cannot be specified together.
• Refactor DisabledResourceConfig type into a generic ResourceConfig so that we can reuse it for both Allowed and Disabled resource configs. During initializing DisabledResourceConfig, fleet and built-in resources are configured.
• Update change_detector to watch only the allowed resources if specified.
• Update resource_selector to only select allowed resources if specified.
• Add a util function with unit test to determine if a ResourceConfig is empty

Other changes

• Add make help recipe for developers to list the available commands in the Makefile.

Fixes #633

I have:

• Run make reviewable to ensure this PR is ready for review.

How has this code been tested

Verify that the options are mutually exclusive.

E1213 17:04:40.247238   91214 main.go:79] "invalid parameter" err="Options.AllowedPropagatingAPIs: Invalid value: \"policy/v1\": AllowedPropagatingAPIs and SkippedPropagatingAPIs are mutually exclusive"
exit status 1

Run hub-agent locally, its able to start with the right option value for --allowed-propagating-apis

❯ export POD_NAMESPACE=fleet-system
❯ go run ./cmd/hubagent/main.go --enable-v1alpha1-apis=false --enable-v1beta1-apis=true --allowed-propagating-apis=rbac.authorization.k8s.io/v1 --v=1
I1214 09:19:00.292904   85484 main.go:76] "flag:" name="add_dir_header" value="false"
I1214 09:19:00.293211   85484 main.go:76] "flag:" name="allowed-propagating-apis" value="rbac.authorization.k8s.io/v1"

Verify that the Allowed resources are being watched and informer is created

I1214 09:19:11.823118   85484 change_dector.go:205] "Watching Allowed Resource" GVK="rbac.authorization.k8s.io/v1, Kind=ClusterRole"
I1214 09:19:11.823254   85484 change_dector.go:205] "Watching Allowed Resource" GVK="rbac.authorization.k8s.io/v1, Kind=Role"
I1214 09:19:11.823345   85484 change_dector.go:205] "Watching Allowed Resource" GVK="rbac.authorization.k8s.io/v1, Kind=ClusterRoleBinding"
I1214 09:19:11.823394   85484 change_dector.go:205] "Watching Allowed Resource" GVK="rbac.authorization.k8s.io/v1, Kind=RoleBinding"
I1214 09:19:11.826453   85484 informermanager.go:123] "Added an informer for a new resource" res={"GroupVersionKind":{"Group":"rbac.authorization.k8s.io","Version":"v1","Kind":"ClusterRole"},"GroupVersionResource":{"Group":"rbac.authorization.k8s.io","Version":"v1","Resource":"clusterroles"},"IsClusterScoped":true}
I1214 09:19:11.826502   85484 informermanager.go:123] "Added an informer for a new resource" res={"GroupVersionKind":{"Group":"rbac.authorization.k8s.io","Version":"v1","Kind":"Role"},"GroupVersionResource":{"Group":"rbac.authorization.k8s.io","Version":"v1","Resource":"roles"},"IsClusterScoped":false}
I1214 09:19:11.826519   85484 informermanager.go:123] "Added an informer for a new resource" res={"GroupVersionKind":{"Group":"rbac.authorization.k8s.io","Version":"v1","Kind":"ClusterRoleBinding"},"GroupVersionResource":{"Group":"rbac.authorization.k8s.io","Version":"v1","Resource":"clusterrolebindings"},"IsClusterScoped":true}
I1214 09:19:11.826536   85484 informermanager.go:123] "Added an informer for a new resource" res={"GroupVersionKind":{"Group":"rbac.authorization.k8s.io","Version":"v1","Kind":"RoleBinding"},"GroupVersionResource":{"Group":"rbac.authorization.k8s.io","Version":"v1","Resource":"rolebindings"},"IsClusterScoped":false}

It selects the correct resources

    - lastTransitionTime: "2023-12-14T03:54:43Z"
      message: Successfully applied resources
      observedGeneration: 1
      reason: ApplySucceeded
      status: "True"
      type: ResourceApplied
  selectedResources:
  - group: rbac.authorization.k8s.io
    kind: Role
    name: vbongale-test-lease-role
    namespace: vbongale-test-ns
    version: v1
  - kind: Namespace
    name: vbongale-test-ns
    version: v1

Running tool: /opt/homebrew/bin/go test -timeout 30s -run ^TestResourceConfigIsEmpty$ go.goms.io/fleet/pkg/utils
ok  	go.goms.io/fleet/pkg/utils

$ make help

❯ make help

Usage:
  make <target>
  help             Display this help.
  lint-full        Run slower linters to detect possible issues
  fmt              Run go fmt against code.
  vet              Run go vet against code.
  test             Run tests.
  local-unit-test  Run tests.
  integration-test  Run tests.
  build            Build agent binaries.
  run-hubagent     Run a controllers from your host.
  run-memberagent  Run a controllers from your host.
  clean-bin        Remove all generated binaries