[Epic]: Metadata component for XR engine

[SYBIOTE]

Proposed features

• [ ] Core engine component for storing information in a dictionary format called metadata component
• [ ] User introduced metadata for entities User interface in editor involving
  • check box for enable disable,
  • input field/fixed text for key
  • input field for value
  • button to add key value pair
  • button to remove key value pair
• [ ] Automatically link metadata of child metadata component to parent metadata component in child key in upcoming ECS reader
• [ ] Make digital beings read metadata for scene descriptions, Text- to - speech and object/ entity descriptions
• [ ] demo feature and functionality