Add PyPI classifiers to pyproject.toml

[elhoim]

Finding 44 (Low) — pyproject.toml:5

Problem

The [project] table declares no classifiers at all, so the package does not appear under PyPI's classifier-based filters and search facets.

Fix

Finding 44 (low, add-classifiers): pyproject.toml's [project] table declared no classifiers field, so the package wouldn't surface under PyPI's classifier-based filters/search facets. Added Development Status, Intended Audience, License, and Programming Language classifiers — the license classifier (AGPLv3) and Python version range (3.10-3.12) were chosen to match the repo's actual LICENSE file and the requires-python = ">=3.10" constraint already in pyproject.toml.

Verification

Reproduced against the unmodified code at 9b8c605, then re-checked after the change.

Before

Inspection (this is a packaging-metadata finding, no runtime behaviour): `python3 -c "import tomllib; print(tomllib.load(open('pyproject.toml','rb'))['project'].get('classifiers'))"` on the base commit raises KeyError / prints nothing — no `classifiers` key exists. Confirmed via `git show 9b8c6052...:pyproject.toml | grep classifiers` → no match. Building the sdist (`python3 -m build --sdist`) and inspecting `PKG-INFO` shows zero `Classifier:` lines.

After

After the fix, `python3 -m build --sdist --outdir /tmp/build_out .` succeeds and `grep -i classifier misp_modules_cli.egg-info/PKG-INFO` shows 7 Classifier lines: Development Status :: 4 - Beta; Intended Audience :: Information Technology; License :: OSI Approved :: GNU Affero General Public License v3; Programming Language :: Python :: 3, 3.10, 3.11, 3.12.

python bin/cli.py --help exits 0 and the module still imports cleanly. Verification was performed offline against the pure functions — no running misp-modules instance is required.

Branched from 9b8c605. This PR addresses only this finding; the other findings from the same review are in separate PRs, so they will need rebasing against each other as they merge.

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