feat: add mojo-compress tool

[P403n1x87]

We add a tool to compress MOJO files, similar to austin-compress for the legacy austin collapsed stack format.

[codecov]

Codecov Report

❌ Patch coverage is 96.07843% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.49%. Comparing base (15a7321) to head (e38054b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
austin/format/mojo_compress.py	95.91%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
+ Coverage   74.80%   76.49%   +1.69%     
==========================================
  Files          19       20       +1     
  Lines        1786     1834      +48     
  Branches      221      229       +8     
==========================================
+ Hits         1336     1403      +67     
+ Misses        373      358      -15     
+ Partials       77       73       -4     

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