Feature Request: Add Support for Custom HTTP Headers in image_network

[bhagatdanish]

I am using your package, image_network, and I have encountered a limitation when working with secure images that require custom HTTP headers (e.g., Authorization tokens). Currently, the package does not provide an option to include HTTP headers when loading images. This restricts its usage in scenarios where secure image loading is required, such as images hosted on private servers or services with authentication.

So, It would be great if the package provided an option to include custom HTTP headers when loading images.