Cleanup adapters code and add javascript adapter

[RemcoSmitsDev]

This PR cleans up the adapters code, the code for installing/fetching a binary is now in 2 separate methods for the Separation of Concerns. It's also more streamlined how the adapter should be implemented.

This PR also adds the JavaScript debug adapter, which I will work on right after this PR.

cc @Anthony-Eid

To tests JavaScript debugging, you need to have the following task:

{
	"label": "Javascript Debug file",
	"command": "Javascript Debug file",
	"task_type": {
		"type": "debug",
		"kind": "javascript",
		"program": "/Users/remcosmits/Documents/code/prettier-test/test.js",
		"request": "launch",
		"initialize_args": {
			"cwd": "/Users/remcosmits/Documents/code/prettier-test" // This is required for now, later the adapter will insert this.
		}
	}
}

Note:
Debugging JavaScript only works if you pass in a program, I will work on making the other reverse requests work, so we can support more ways how you can debug JavaScript.