Migrate to UV (#1748)

* Switch to using `uv` for dependency management and update related project workflows and scripts

* Expand contributing documentation with instructions for using `uv`, including dependency management, testing, linting, and docs workflows.

* Add changelog entry for migration to `uv` for dependency management and workflows

CHANGES/1748.misc.rst

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+Migrated from ``hatch`` to ``uv`` for dependency management and development workflows.
+
+This change improves developer experience with significantly faster dependency resolution (10-100x faster than pip), automatic virtual environment management, and reproducible builds through lockfile support.
+
+**What changed for contributors:**
+
+- Install dependencies with ``uv sync --all-extras --group dev --group test`` instead of ``pip install -e .[dev,test,docs]``
+- Run commands with ``uv run`` prefix (e.g., ``uv run pytest``, ``uv run black``)
+- All Makefile commands now use ``uv`` internally (``make install``, ``make test``, ``make lint``, etc.)
+- Version bumping now uses a custom ``scripts/bump_version.py`` script instead of ``hatch version``
+
+**What stayed the same:**
+
+- Build backend remains ``hatchling`` (no changes to package building)
+- Dynamic version reading from ``aiogram/__meta__.py`` still works
+- All GitHub Actions CI/CD workflows updated to use ``uv``
+- ReadTheDocs builds continue to work without changes
+- Development dependencies (``dev``, ``test``) moved to ``[dependency-groups]`` section
+- Documentation dependencies (``docs``) remain in ``[project.optional-dependencies]`` for compatibility
+
+Contributors can use either the traditional ``pip``/``venv`` workflow or the new ``uv`` workflow - both are documented in the contributing guide.