Add Generic Plugin Examples

[wymcg]

Currently, only Rust has a generic example plugin in the examples folder. Extism supports writing plugins in other languages, including Go, C, and JavaScript.

Choose one of the languages that Extism supports and write a generic plugin that does the following:

1. Gets matrix width and height from the config
2. Fades from black to white
3. Halts the plugin when the matrix finishes fading
4. Makes a few generic logs using the logging host functions, if host functions are supported by that language's PDK