Codegen: Generate docs for composable kinds (#61719)

* Generate docs for composable kinds

* Fix getting the kind schema

* Generate composable kinds docs

* Add disclaimer to the generated docs

* Change docs disclaimer

pkg/plugins/pfs/decl.go

@@ -13,6 +13,7 @@ type PluginDecl struct {
 	Imports         []*ast.ImportSpec
 	PluginPath      string
 	PluginMeta      plugindef.PluginDef
+	KindDecl        kindsys.Decl[kindsys.ComposableProperties]
 }
 
 func EmptyPluginDecl(path string, meta plugindef.PluginDef) *PluginDecl {

pkg/plugins/pfs/decl_parser.go

@@ -61,6 +61,7 @@ func (psr *declParser) Parse(root fs.FS) ([]*PluginDecl, error) {
 				Imports:         pp.CUEImports,
 				PluginMeta:      pp.Properties,
 				PluginPath:      path,
+				KindDecl:        kind.Decl(),
 			})
 		}
 	}