feat!: rename @payloadcms/ui/client to @payloadcms/ui, and other auto-suggestion & exports improvements (#6848)

**BREAKING:** All `@payloadcms/ui/client` exports have been renamed to
`@payloadcms/ui`. A simple find & replace across your entire project
will be enough to migrate. This change greatly improves import
auto-completions in IDEs which lack proper support for package.json
exports, like Webstorm.

packages/storage-uploadthing/package.json

@@ -14,8 +14,8 @@
   "exports": {
     ".": {
       "import": "./src/index.ts",
-      "require": "./src/index.ts",
-      "types": "./src/index.ts"
+      "types": "./src/index.ts",
+      "default": "./src/index.ts"
     }
   },
   "main": "./src/index.ts",
@@ -48,8 +48,8 @@
     "exports": {
       ".": {
         "import": "./dist/index.js",
-        "require": "./dist/index.js",
-        "types": "./dist/index.d.ts"
+        "types": "./dist/index.d.ts",
+        "default": "./dist/index.js"
       }
     },
     "main": "./dist/index.js",