We need to jump through a few extra hoops when the SourceKit plugin is located in SourceKit-LSP’s build folder and we are using `sourcekitd_plugin_initialize` instead of `sourcekitd_plugin_initialize_2`.
This adds a sourcekitd plugin that drives the code completion requests. It also includes a `CompletionScoring` module that’s used to rank code completion results based on their contextual match, allowing us to show more relevant code completion results at the top.