Add configurable Google Drive toggle in the Documents admin section along with necessary config scaffolding

src/lib/components/chat/MessageInput/InputMenu.svelte

@@ -154,6 +154,7 @@
 				<div class="line-clamp-1">{$i18n.t('Upload Files')}</div>
 			</DropdownMenu.Item>
 
+			{#if $config?.features?.enable_google_drive}
 			<DropdownMenu.Item
 				class="flex gap-2 items-center px-3 py-2 text-sm font-medium cursor-pointer hover:bg-gray-50 dark:hover:bg-gray-800 rounded-xl"
 				on:click={() => {
@@ -188,6 +189,7 @@
 				</svg>
 				<div class="line-clamp-1">{$i18n.t('Google Drive')}</div>
 			</DropdownMenu.Item>
+			{/if}
 		</DropdownMenu.Content>
 	</div>
 </Dropdown>