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

還沒有人認領這個 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)

從 script/core/diagnostics/init.lua 開始，查看第 158 行附近的排序邏輯和第 180 行附近的執行時間測量。啟用和停用 await.delay()，比較診斷成本陣列，以重現此問題。當診斷執行發生 yield 時，診斷仍能依照有意義的測量成本排序，即表示完成。

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