Schemas: Refactor plugin's metadata (#83696)

* Remove kinds verification for kind-registry

* Read plugin's json information with json library instead of use thema binding

* Remove grafanaplugin unification

* Don't use kindsys for extract the slot name

* Fix IsGroup

* Remove all plugindef generation

* Refactor schema interfaces

* Pushed this change from a different branch by mistake...

* Create small plugin definition structure adding additional information for plugins registration

* Add some validation checks

* Delete unused code

* Fix imports lint

pkg/plugins/pfs/decl_parser.go

@@ -6,7 +6,6 @@ import (
 	"path/filepath"
 	"sort"
 
-	"github.com/grafana/kindsys"
 	"github.com/grafana/thema"
 )
 
@@ -15,6 +14,18 @@ type declParser struct {
 	skip map[string]bool
 }
 
+// Extracted from kindsys repository
+var schemaInterfaces = map[string]*SchemaInterface{
+	"PanelCfg": {
+		Name:    "PanelCfg",
+		IsGroup: true,
+	},
+	"DataQuery": {
+		Name:    "DataQuery",
+		IsGroup: false,
+	},
+}
+
 func NewDeclParser(rt *thema.Runtime, skip map[string]bool) *declParser {
 	return &declParser{
 		rt:   rt,
@@ -50,12 +61,11 @@ func (psr *declParser) Parse(root fs.FS) ([]*PluginDecl, error) {
 		}
 
 		for slotName, kind := range pp.ComposableKinds {
-			slot, err := kindsys.FindSchemaInterface(slotName)
 			if err != nil {
 				return nil, fmt.Errorf("parsing plugin failed for %s: %s", dir, err)
 			}
 			decls = append(decls, &PluginDecl{
-				SchemaInterface: &slot,
+				SchemaInterface: schemaInterfaces[slotName],
 				Lineage:         kind.Lineage(),
 				Imports:         pp.CUEImports,
 				PluginMeta:      pp.Properties,