use libuv async to init

[jinzhongjia]

No substantial functional reconstruction has been carried out, just to improve the operating efficiency of the plug-in.

• [x] code_action
• [x] rename bfce1ba27f048e629523ea392f59291000dc525d
• [x] lightbulb
• [x] diagnostic
• [x] hover
• [x] post_abstract

[jinzhongjia]

others no need for async yet