Use Package Access Modifier

[cpisciotta]

Downgrade existing types to use the package access level modifier. In a future PR, introduce a public type for XCBeautifyLib consumers.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (385a721) 86.27% compared to head (1d39b04) 86.26%.

Files	Patch %	Lines
Sources/XcbeautifyLib/Parser.swift	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
- Coverage   86.27%   86.26%   -0.01%     
==========================================
  Files          13       13              
  Lines        1537     1536       -1     
==========================================
- Hits         1326     1325       -1     
  Misses        211      211              

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