Add finding CLI commands

Add prb finding subcommands: create, list, view, update, and delete.
Register the finding command group in the root command and update
the factory to expose FindingService.

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/cmd/cmdutil/factory.go

@@ -21,6 +21,6 @@ import (
 
 type Factory struct {
 	IOStreams *iostreams.IOStreams
-	Version   string
-	Config    func() (*config.Config, error)
+	Version  string
+	Config   func() (*config.Config, error)
 }