Kindsys: Unify plugins, pfs with kind framework (#61192)

* New pfs impl

* Reached codegen parity with old system

* Update all models.cue inputs

* Rename all models.cue files

* Remove unused prefixfs

* Changes Queries->DataQuery schema interface

* Recodegen

* All tests passing, nearly good now

* Add SchemaInterface to kindsys props

* Add pascal name deriver

* Relocate plugin cue files again

* Clarify use of injected fields

* Remove unnecessary aliasing

* Move DataQuery into mudball

* Allow forcing ExpandReferences on go type generation

* Move DataQuery def into kindsys, add generator to copy it to common

* Fix copy generator to replace package name correctly

* Fix duplicate type, test failure

* Fix linting issues

pkg/kindsys/common_dataquery.cue

@@ -0,0 +1,37 @@
+package kindsys
+
+// Canonically defined in pkg/kindsys/dataquery.cue FOR NOW to avoid having any external imports
+// in kindsys. Code generation copies this file to the common schemas in packages/grafana-schema/src/common.
+//
+// NOTE make gen-cue must be run twice when updating this file
+
+// These are the common properties available to all queries in all datasources.
+// Specific implementations will *extend* this interface, adding the required
+// properties for the given context.
+DataQuery: {
+	// A - Z
+	refId: string
+
+	// true if query is disabled (ie should not be returned to the dashboard)
+	hide?: bool
+
+	// Unique, guid like, string used in explore mode
+	key?: string
+
+	// Specify the query flavor
+	// TODO make this required and give it a default
+	queryType?: string
+
+    // For mixed data sources the selected datasource is on the query level.
+    // For non mixed scenarios this is undefined.
+	// TODO find a better way to do this ^ that's friendly to schema
+	// TODO this shouldn't be unknown but DataSourceRef | null
+	datasource?: _
+} @cuetsy(kind="interface")
+
+DataSourceRef: {
+	// The plugin type-id
+	type?: string
+	// Specific datasource instance
+	uid?: string
+} @cuetsy(kind="interface")