chore: Add custom benchmark configs

[filzrev]

This PR intended to add functionality to switch BenchmarkConfig via command line arguments.

How to switch benchmark config

By default. DefaultBenchmarkConfig is used.
It's almost same as existing [ShortRunJob] + [MemoryDiagnoser] based benchmarks.

And when following config key is specified as extra argument (e.g. -- Test)
Benchmark is executed with corresponding BenchmarkConfig.

List of custom BenchmarkConfig keys

• Default
• InProcess
• Test (or InProcessMonitoring)
• ColdStart
• TargetFrameworks
• NuGetVersions

What's changed in this PR

1. Add README.md file.
2. Add following custom benchmark configs.
   2.1. DefaultBenchmarkConfig
   2.2. InProcessBenchmarkConfig
   2.3. InProcessMonitoringBenchmarkConfig
   2.4. ColdStartBenchmarkConfig
   2.5. TargetFrameworksBenchmarkConfig
   2.6. NuGetVersionsBenchmarkConfig
3. Modify Benchmark.csproj
   3.1. Add settings for NuGetVersionsBenchmarkConfig
   3.2. Add cleanup target to delete BenchmarkDotNet artifacts.
   2.3. Add Cysharp/Kokuban package to write colored console output.
4. Modify Program.cs to execute benchmark with custom BenchmarkConfig.
5. Remove [ShortRunJob] and [MemoryDiagnoser] from existing benchmarks
6. Remove unrequired arguments from benchmark.yml

[neuecc]

Thank you!
I'm also learning a lot about the setup methods.
Thank you for the detailed ReadMe as well.