feat(image): add support for custom HTTP headers in image requests

[usmanvrtx]

Summary

Add support for custom HTTP headers in network images.

Key Changes

Image Request Handling

• Enable passing custom HTTP headers (e.g., Authorization) with network image requests.
• Extend existing image loading logic to include header configuration.
• Ensure headers are correctly attached to all outgoing image fetch requests.

API Consistency

• Align network image behavior with standard HTTP request patterns.
• Avoid ad-hoc workarounds for authenticated or protected image resources.

Code Improvements

• Refactor request pipeline to support header injection cleanly.
• Maintain backward compatibility for existing image usage.

Video Demonstration
Watch video

Usage Example

- Image:
    source: https://example.com/image.png
    headers:
      Authorization: "Bearer ${token}"
      X-Custom-Header: "my-custom-value"

[TheNoumanDev]

LGTM