chore: Update benchmarks

[filzrev]

What's included in this PR

1. Update BenchmarkDotNet package to latest version
2. Update System.CommandLine from beta1 to beta4
3. Modify Program.cs and add launchSettings.json for measuring average cold startup time

Benchmark results

dotnet run -c Release -- --launchCount 20

Method	Mean	Error	StdDev	Ratio	RatioSD	Allocated	Alloc Ratio
'ConsoleAppFramework v5'	1.558 ms	0.1154 ms	0.1329 ms	1.01	0.11	400 B	1.00
CliFx	24.850 ms	0.5209 ms	0.5999 ms	16.04	1.25	57640 B	144.10
System.CommandLine	29.528 ms	3.3015 ms	3.8020 ms	19.07	2.79	18720 B	46.80
Cocona.Lite	47.108 ms	0.8073 ms	0.9297 ms	30.42	2.34	59784 B	149.46
Spectre.Console.Cli	54.705 ms	0.8616 ms	0.9922 ms	35.32	2.70	65680 B	164.20
Cocona	134.436 ms	1.5971 ms	1.8392 ms	86.80	6.56	461640 B	1,154.10

It seems System.CommandLine performance is significantly improved.

[neuecc]

I see, so NamingConventionBuilder gives good results...?
I have no idea what the correct way to use System.CommandLine is, but it's interesting anyway.