kindsys: Return Decl from Kinds (#59075)

* kindsys: Return Decl from Kinds

* Add funcs to extract DeclForGen from kinds

pkg/kindsys/kind.go

@@ -58,7 +58,7 @@ type Raw interface {
 	Interface
 
 	// TODO docs
-	Meta() RawMeta
+	Decl() *Decl[RawMeta]
 }
 
 type Structured interface {
@@ -68,7 +68,7 @@ type Structured interface {
 	Lineage() thema.Lineage
 
 	// TODO docs
-	Meta() CoreStructuredMeta // TODO figure out how to reconcile this interface with CustomStructuredMeta
+	Decl() *Decl[CoreStructuredMeta] // TODO figure out how to reconcile this interface with CustomStructuredMeta
 }
 
 // type Composable interface {

pkg/kindsys/kindmetas.go

@@ -2,7 +2,7 @@ package kindsys
 
 import "github.com/grafana/thema"
 
-// CommonMeta contains the kind metadata common to all categories of kinds.
+// CommonMeta contains the metadata common to all categories of kinds.
 type CommonMeta struct {
 	Name              string   `json:"name"`
 	PluralName        string   `json:"pluralName"`