Diagnostics run `await.delay()` too often

https://github.com/LuaLS/lua-language-server/pull/2664 got a 25% speed increase by disabling await.delay() for the non-interactive use case.

Many diagnostics call await.delay() for every single ast node they check, so running all diagnostics on a file will probably reschedule the thread more than once per node which is a significant overhead.

I guess fully removing it for the interactive use case isn't a great solution, but maybe there is some kind of middleground like only rescheduling only every n calls?

首先检查 PR 2664，并定位针对每个 AST 节点调用 await.delay() 的诊断路径。比较交互式和非交互式行为，然后确定并测量一种能够降低开销、同时不移除交互式保护机制的重新调度策略。