chore(packaging): MIT license + consolidate metadata into pyproject

- Add MIT LICENSE (PEP 639 'license = "MIT"' + license-files).
- Move all metadata into a [project] table (description, readme, authors,
  keywords, classifiers); drop the now-redundant setup.py.
- Declare bitarray and pycryptodome: used by pm3py.sim and the transponder
  crypto paths but previously undeclared, so a clean install failed on the
  README's own 'from pm3py.sim import SimSession'.
- gitignore build/ and dist/.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -2,6 +2,8 @@ __pycache__/
 *.pyc
 *.egg-info/
 .pytest_cache/
+build/
+dist/
 venv/
 .venv/
 .worktrees/