perf(file_server): hoistStatic and simplify operations

[markthree]

The file_server example has been optimized without unfairness。

Here is the performance of file_server/deno_server.ts before and after optimization

Before optimization

---

After optimization

Other examples have been more or less optimized.

Test data provided by plow

Similar optimization tips in the community:

• vitejs/vite/pull/12654
• vue-macros.sxzz.moe/features/hoist-static

[Im-Beast]

I'm skeptical about this PR for multiple reasons. It might improve performance but gives up on readability, and it isn't what most people would do – std manual shows usage as shown below:

Additionally by running benchmarks on my PC it seems like it doesn't do anything regarding performance (if not degrades it). Benchmark results from your code show some receiving 0.5-3% decline in throughput. These amounts (looking that the second place also dropped by the same amount) mean that these changes do neglibile amounts of gains while loose substantial amounts of readability.

[BEFORE]

[AFTER]

I'm still open for these kinds of PR's. If these results show significant enough performance gains on anyone else's computers, please let me know.

[markthree]

I'm sorry I only tested file_server/deno_server.ts and used plow to keep hitting http://localhost:8000/doggy.jpeg。
Optimized for better performance on the computer it is on. Of course I have no more other computers to provide bench data.
I will close this pr for the balance of readability and performance improvement.
Thank you for providing the performance bench for all cases.