Remove redundant check list in quickFix.ts and FixableCheck

[karlvr]

It's a trifle annoying to have to add checks to quickFix.ts in additional to FixableCheck. What do you think about having the extension load the list of checks from the Java component, so it doesn't need to maintain its own list, but it can still decide whether a Diagnostic is fixable without invoking the Java code.

Also FixableCheck could be removed if we instead put the check names into the quick fix classes themselves, and then QuickFixServer could build a list of the supported checks and the matching quick fixes.

e.g.

abstract public class BaseQuickFix {

    public abstract String[] getSupportedChecks();

}

[jdneo]

I agree that distributing such quickfix information everywhere is a bad way for implementation. And sometime it introduces bugs. For example, when we have fix for the violation but for some reason the fix failed to generate the worksapce edit, then the UX goes into an unresponsive state.

I would be great if the quickfix list can be rendered on demand!