Add Ruff formatting automation

[cdenihan]

Summary

• Add Ruff as the pinned Python formatter/import sorter with ROS 2-compatible settings: 100-char lines, single quotes, spaces, LF line endings, and Python 3.10 target syntax for Ubuntu 22.04 / ROS Humble.
• Add local scripts for formatting and checking formatting.
• Add a GitHub Actions workflow on ubuntu-22.04 with Python 3.10 that autoformats PR branches via autofix.ci and checks main pushes.
• Add Dependabot updates for GitHub Actions and the pinned pip dev dependency.
• Apply the initial repository-wide Ruff formatting pass.

Research notes

• ROS 2 Python style uses PEP 8 with 100-character lines and single quotes where possible.
• Ubuntu 22.04 targets Python 3.10, so Ruff is configured with target-version = "py310" to avoid Python 3.12-only formatting/syntax issues such as PEP 701 f-string changes.
• Ruff was selected over Black because Black forces double-quote normalization by default, while Ruff can enforce the ROS 2 single-quote preference and still provide deterministic formatting plus import ordering.

Verification

• PYTHON=.venv/bin/python ./scripts/format
• PYTHON=.venv/bin/python ./scripts/check-format
• git diff --check
• .venv/bin/python -m compileall -q launch models mavinsight test setup.py

Note, I could not run full ROS/colcon tests locally because my MacBook does not have ROS2 on it

[cdenihan]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Resolved the merge conflicts and merged origin/main in b793fb9 (with follow-up tweaks through 241b722).