A common platform interface for the flutter_tex_js plugin.

This interface allows platform-specific implementations of the flutter_tex_js plugin, as well as the plugin itself, to ensure they are supporting the same interface.


To implement a new platform-specific implementation of flutter_tex_js, extend TexRendererPlatform with an implementation that performs the platform-specific behavior, and when you register your plugin, set the default TexRendererPlatform by calling TexRendererPlatform.instance = MyPlatformTexRenderer().