Logic to sort diagnostics by cost doesn't work because of async processing

还没有人认领这个 Issue。

I found some logic in diagnostics/init.lua that doesn't work as expected: https://github.com/LuaLS/lua-language-server/blob/87abc4245f2a24e1cc35851b6464af9588934286/script/core/diagnostics/init.lua#L158 tries to sort diagnostics by cost to run cheap diags first.

However, the code to measure to runtime at https://github.com/LuaLS/lua-language-server/blob/87abc4245f2a24e1cc35851b6464af9588934286/script/core/diagnostics/init.lua#L180 does to by calling os.clock() before and after invoking a given diagnostic.

This doesn't work if the diagnostic yields during execution, and most diagnostics do exactly that via `await.delay()`. The end result is that the order is pretty much random (which I confirmed by looking at the diagCost arrays with and without await.delay() enabled)

从 script/core/diagnostics/init.lua 开始，查看第 158 行附近的排序逻辑和第 180 行附近的运行时测量。启用和禁用 await.delay()，比较诊断成本数组，以重现该问题。当诊断执行发生 yield 时，诊断仍能按照有意义的测量成本排序，即表示完成。

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