BF: fix memory leak for uncompressed .trx files

[skoudoro]

Fixes #108

This pull request updates the resource cleanup logic for memory-mapped files in the trx package and adds a new test to ensure proper handle release. The main improvement is that close() will always release mmap handles, even when loaded from a zip file, regardless of the presence of an uncompressed folder handle.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.64%. Comparing base (4bdd8a8) to head (df7e7d3).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
+ Coverage   61.50%   61.64%   +0.14%     
==========================================
  Files          13       13              
  Lines        2613     2623      +10     
==========================================
+ Hits         1607     1617      +10     
  Misses       1006     1006              

Flag	Coverage Δ
unittests	61.64% <100.00%> (+0.14%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[arokem]

LGTM! @frheault (or others) : I would really appreciate another set of eyes, if you have the bandwidth.

[frheault]

I'm happy it seems like past me thought about it, but I was just bad at it !

Thank you for the fix