[feat] Add support for chat stickers

This commit adds support for chat stickers by allowing users to use stickers in chat message window.
The users can toggle show additional asset list using a button.
Added Additional assets file extension data.
Additional assets list shows preview.
Optimized render when use streaming api. (prevent markdown again when message not changed)
Added controls to Video/Audio Assets

src/lib/Setting/Pages/DisplaySettings.svelte

@@ -141,4 +141,12 @@
 
 <div class="flex items-center mt-2">
     <Check bind:check={$DataBase.useChatCopy} name={language.useChatCopy}/>
-</div>
+</div>
+
+
+{#if $DataBase.useExperimental}
+    <div class="flex items-center mt-2">
+        <Check bind:check={$DataBase.useChatSticker} name={language.useChatSticker}/>
+        <Help key="experimental" name={language.useChatSticker}/>
+    </div>
+{/if}