Drastically Improve Speed and Memory Performance

[cpisciotta]

Changes

Drastically improve xcbeautify's performance (time and memory). Testing with a large xcodebuild log, this change dropped xcbeautify's execution time by ~90% and memory footprint by ~99%.

• Reduce unnecessary type instantiations, namely NSRegularExpression.
• Skip parsing empty lines.
• Introduce time-tracking logic and large xcodebuild log test to (1) find and fix the existing issue and (2) prevent future performance regressions.

Testing

Average results after formatting large_xcodebuild_log.txt (99.9 MB xcodebuild log).

Measurement	Before	After	Absolute Difference	Percentage Difference
Memory	2.21 GB	8.3 MB	-2254.74 MB / -2.2 GB	-99.63%
Time	66 seconds	5.9 seconds	-60.1 seconds	-91%

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 89.47368% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 84.94%. Comparing base (092bb2d) to head (cbc94b2).

Files	Patch %	Lines
Sources/XcbeautifyLib/Parser.swift	33.33%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #253 +/- ## ========================================== - Coverage 85.76% 84.94% -0.82% ========================================== Files 14 14 Lines 1545 1461 -84 ========================================== - Hits 1325 1241 -84 Misses 220 220 ```

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