feat!: rename @payloadcms/plugin-cloud (#8828)

BREAKING CHANGE: Rename `@payloadcms/plugin-cloud` to
`@payloadcms/payload-cloud`. Anyone using the existing plugin will need
to switch to using the new package.

## Why?

Since v3 will be using _fixed versioning_, all versions of `^3` must be
available. Unfortunately, the `@payloadcms/plugin-cloud` version has
already breached that version number. Renaming will allow it to be on
the same version as other monorepo packages.

Additionally, the name `plugin-cloud` is quite ambiguous and sometimes
is confused with `plugin-cloud-storage`, so using `payload-cloud` feels
like a good move to make this more evident.

test/payload-cloud/collections/Media.ts

@@ -0,0 +1,32 @@
+import type { CollectionConfig } from 'payload'
+
+export const Media: CollectionConfig = {
+  slug: 'media',
+  access: {
+    read: () => true,
+    create: () => true,
+  },
+  upload: {
+    imageSizes: [
+      {
+        height: 400,
+        width: 400,
+        crop: 'center',
+        name: 'square',
+      },
+      {
+        width: 900,
+        height: 450,
+        crop: 'center',
+        name: 'sixteenByNineMedium',
+      },
+    ],
+  },
+  fields: [
+    {
+      name: 'alt',
+      label: 'Alt Text',
+      type: 'text',
+    },
+  ],
+}

test/payload-cloud/collections/Users.ts

@@ -0,0 +1,16 @@
+import type { CollectionConfig } from 'payload'
+
+export const Users: CollectionConfig = {
+  slug: 'users',
+  auth: true,
+  admin: {
+    useAsTitle: 'email',
+  },
+  access: {
+    read: () => true,
+  },
+  fields: [
+    // Email added by default
+    // Add more fields as needed
+  ],
+}