Codegen: Isolate schema generation code (#98742)

* Create go.mod files for plugins and core kinds

* Update go work and main go.mod dependencies

* Update pfs import

* Missing update of pfs dependency

* Remove fixed cuelang dependency

* Update codeowners

* Update workspace

* Update Dockerfile

* Missing go.mod codeowner

* Use intermediate kin-openapi dependency to make all workspaces to work

pkg/plugins/codegen/pfs/decl.go

@@ -0,0 +1,26 @@
+package pfs
+
+import (
+	"cuelang.org/go/cue"
+	"cuelang.org/go/cue/ast"
+)
+
+type PluginDecl struct {
+	SchemaInterface SchemaInterface
+	CueFile         cue.Value
+	Imports         []*ast.ImportSpec
+	PluginPath      string
+	PluginMeta      Metadata
+}
+
+type SchemaInterface struct {
+	Name    string
+	IsGroup bool
+}
+
+type Metadata struct {
+	Id      string
+	Name    string
+	Backend *bool
+	Version *string
+}