…r-plugin.

All code actions have been moved to hls-refactor-plugin

Mostly straightforward, only slight complication was that completion auto imports
depends on exactprint, but I didn't want to remove all completion logic from ghcide
just for this.

Instead, I added logic to dynamically lookup the plugin that provides
the extend import command, so that auto imports work as expected when you have
hls-refactor-plugin enabled.

Move lookupPluginId out of loop

Replace code actions with lenses in benchmarks

Allow plugins to use GetAnnotatedParsedSource by linking it in when depended on

Move lookupPluginId to IdePlugins

Add default extensions

Move traceAst