Add typesafe version of get_parameter

[sagudev]

Currently user needs to know what kind of data will query to get parameter return, this is error prone. Instead I propose get_parameter that gets it's target argument via generic (ex: gl.get_parameter::<ALPHA_BITS>()), so we can dispatch to proper type at compile time without worrying user what kind of function call should be used (this would also make porting WebGL code to rust easier).

I have a rough prototype of how this implementation would look like in this playground: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=c6922a88ef3d74c8890f70ee79d21f1c

This would be backwards compatible, but get_parameter must not be added to HasContext as it would make it not object safe due to generic arguments.