extract kindsys to external library (#64562)

* extract kindsys

* reinstate kindsys report

This may end up living somewhere else (or not! who knows!), but the important part is that I don't get rid of it right now :)

I hate the package layout (kindsysreport/codegen) for the main function and will take pretty much any alternative suggestion, but we can change also change it later.

Note that the generated report.json is in a different location - anything using this (ops something) needs to be updated.

* kindsysreport in codeowners

pkg/codegen/tmpl/kind_core.tmpl

@@ -1,9 +1,11 @@
 package {{ .Props.MachineName }}
 
 import (
-	"github.com/grafana/grafana/pkg/kindsys"
+	"github.com/grafana/kindsys"
 	"github.com/grafana/thema"
 	"github.com/grafana/thema/vmux"
+
+	"github.com/grafana/grafana/pkg/cuectx"
 )
 
 // rootrel is the relative path from the grafana repository root to the
@@ -25,7 +27,7 @@ var _ kindsys.Core = &Kind{}
 
 // TODO standard generated docs
 func NewKind(rt *thema.Runtime, opts ...thema.BindOption) (*Kind, error) {
-	def, err := kindsys.LoadCoreKindDef(rootrel, rt.Context(), nil)
+	def, err := cuectx.LoadCoreKindDef(rootrel, rt.Context(), nil)
 	if err != nil {
 		return nil, err
 	}