Simplify Parser and Introduce Formatter

[cpisciotta]

Changes

Major

Simplify Parser to exclusively implement its intended functionality: parsing. Separate formatting-related logic into a new type, Formatter.

Move the beautify method from OutputRendering to Formatter, delete the unnecessary extension on String, and update JunitReporter as necessary. Update XCBeautifier and the executable to wrap Parser, Formatter, and output-related logic.

Minor

• Make types package-accessible, as necessary.
• Update unit tests to support new implementation.

Testing

Performance

	Old (Seconds)	New (Seconds)	Difference (%)
Run 1	4.84	4.88	-
Run 2	4.87	4.73	-
Run 3	4.82	4.79	-
Run 4	4.93	4.73	-
Run 5	4.87	4.75	-
Average	4.866	4.776	-1.87%

[codecov]

Codecov Report

Attention: Patch coverage is 86.40351% with 31 lines in your changes missing coverage. Please review.

Project coverage is 86.81%. Comparing base (8c8be6a) to head (335276c).

Files	Patch %	Lines
Sources/XcbeautifyLib/Formatter.swift	90.20%	19 Missing ⚠️
Sources/XcbeautifyLib/XCBeautifier.swift	0.00%	9 Missing ⚠️
Sources/XcbeautifyLib/Parser.swift	75.00%	2 Missing ⚠️
Sources/XcbeautifyLib/CaptureGroups.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #238      +/-   ##
==========================================
- Coverage   87.79%   86.81%   -0.99%     
==========================================
  Files          14       14              
  Lines        1614     1600      -14     
==========================================
- Hits         1417     1389      -28     
- Misses        197      211      +14     

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