Add ability to open KCL samples in-app (#3912)

* Add a shell script to get the list of KCL samples into the app

* Add support for overwriting current file with sample

* Move these KCL commands down into FileMachineProvider

* Add support for creating a new file on desktop

* Make it so these files aren't set to "renaming mode" right away

* Add support for initializing default values that are functions

* Add E2E tests

* Add a code menu item to load a sample

* Fix tsc issues

* Remove `yarn fetch:samples` from `yarn postinstall`

* Remove change to arg initialization logic, I was holding it wrong

* Switch to use new manifest file from kcl-samples repo

* Update tests now that we use proper sample titles

* Remove double-load from units menu test

* @jtran feedback

* Don't encode `https://` that's silly

* fmt

* Update e2e/playwright/testing-samples-loading.spec.ts

Co-authored-by: Kurt Hutten <k.hutten@protonmail.ch>

* Test feedback

* Add a test step to actually check the file contents were written to (@Irev-Dev feedback)

---------

Co-authored-by: Kurt Hutten <k.hutten@protonmail.ch>

src/lib/commandTypes.ts

@@ -4,6 +4,7 @@ import { Actor, AnyStateMachine, ContextFrom, EventFrom } from 'xstate'
 import { Selection } from './selections'
 import { Identifier, Expr, VariableDeclaration } from 'lang/wasm'
 import { commandBarMachine } from 'machines/commandBarMachine'
+import { ReactNode } from 'react'
 
 type Icon = CustomIconName
 const PLATFORMS = ['both', 'web', 'desktop'] as const
@@ -67,6 +68,12 @@ export type Command<
   name: CommandName
   groupId: T['id']
   needsReview: boolean
+  reviewMessage?:
+    | string
+    | ReactNode
+    | ((
+        commandBarContext: { argumentsToSubmit: Record<string, unknown> } // Should be the commandbarMachine's context, but it creates a circular dependency
+      ) => string | ReactNode)
   onSubmit: (data?: CommandSchema) => void
   onCancel?: () => void
   args?: {
@@ -181,7 +188,7 @@ export type CommandArgument<
         machineContext?: ContextFrom<T>
       ) => boolean)
   skip?: boolean
-  machineActor: Actor<T>
+  machineActor?: Actor<T>
   /** For showing a summary display of the current value, such as in
    *  the command bar's header
    */