Introduce malloc module (part 1)

[junkmd]

#899
To avoid losing the commit history during a squash merge, I'll be merging these separately in parts.

[codecov]

Codecov Report

❌ Patch coverage is 68.42105% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.49%. Comparing base (925c5cb) to head (d9c4b48).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
comtypes/malloc.py	65.71%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #900      +/-   ##
==========================================
- Coverage   85.55%   85.49%   -0.06%     
==========================================
  Files         126      128       +2     
  Lines       12022    12060      +38     
==========================================
+ Hits        10285    10311      +26     
- Misses       1737     1749      +12     

☔ 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.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.