feat: refactored benchmarks and added CliBenchmarks

[TimothyMakkison]

• Added CliBenchmarks containing benchmarks for formatting a directory and checking a list of files.
  • Uses the CSharpier project to format and check. This is more of a benchmark to measure the time to get the files as opposed to a formatting benchmark as the files will become cached.
  • As Soda found in Improve performance of CLI when passing in files/folders #1893, CSharpier is very bad at handing multiple files, each iteration of CliBench took 50 seconds for me 😑
• Benchmarks is getting cluttered so I split it up into CSharpBenchmarks and XmlBenchmarks

Relevant to #1893

[TimothyMakkison]

Should work, but I'm a little confused.

When I run dotnet csharpier format . at the root of my csharpier repo it takes 3 seconds, even when the files haven't changed and thus should be cached
Formatted 447 files in 3881ms.

FormatCli should be identical and yet it runs faster than in terminal
Formatted 447 files in 872ms.

I assume this discrepancy is because the method is allowed to warmup beforehand 🤔

[TimothyMakkison]

Renamed the benchmarks and added Format and FormatNoCache