POC of Black's string preview style formatting

[MichaReiser]

Summary

Test Plan

[MichaReiser]

Current dependencies on/for this PR:

• main
  • PR Split implicit concatenated strings before binary expressions #7145
    • PR Formatter: Implicit concatenation in compare expressions #7193
      • PR Add FString support to binary like formatting #7215
        • PR Add PreviewMode option to formatter #7217
          • PR Extract string part and normalized string #7219
            • PR Introduce StringContinuation data structure #7242
              • PR POC of Black's string preview style formatting #7567 👈

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[codspeed-hq]

CodSpeed Performance Report

Merging #7567 will degrade performances by 59.85%

_{Comparing string-preview-style (5d2513e) with create-string-continuation (272306b)}

Summary

❌ 6 regressions
✅ 19 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	create-string-continuation	string-preview-style	Change
❌	formatter[numpy/globals.py]	1.1 ms	2.7 ms	-59.85%
❌	formatter[unicode/pypinyin.py]	3.4 ms	3.6 ms	-6.76%
❌	linter/all-rules[large/dataset.py]	164 ms	168.1 ms	-2.41%
❌	formatter[large/dataset.py]	52.3 ms	54.9 ms	-4.69%
❌	formatter[numpy/ctypeslib.py]	9.9 ms	14.4 ms	-31.03%
❌	formatter[pydantic/types.py]	19.1 ms	22.7 ms	-15.93%