Immersive User Interface

In Minecraft: Bedrock Edition, we can already set the HUD Opacity. However, we can make it a little better than that!

Here's my suggestion to making it slightly better:
+ Allow the HUD Opacity to be set to 0% (Currently we can set to 1%)
+ Make the HUD visible (100% Opacity) only when relevant events occur. That includes changes on:
   - Health bar
   - Hunger bar
   - XP bar
   - Hotbar Item and Selection

It'll make the game's user interface more immersive, improving the game's experience for some of us who like immersion!