Add uv install options, migrate setup.py to pyproject.toml

[jeonggyukim]

Summary

Adds support for installing pyathena with uv alongside the existing conda + pip flow, without dropping conda. The README now documents three installation options:

1. conda + pip — as before, but pip install -e . --no-deps
2. conda + uv — uv pip install -e . --no-deps, faster editable resolve
3. uv only (no conda) — uv venv + uv pip install -e ., all dependencies from PyPI

Changes

• Migrate package metadata and dependencies from setup.py to pyproject.toml; delete setup.py.
• Port the dependency list from env.yml into pyproject.toml [project.dependencies].
• Rewrite the README install section with the three options and a shared sanity check.

Why --no-deps on the conda paths

setup.py declared no dependencies, so pip install -e . installed only the pyathena package and relied on conda (env.yml) for everything else. Declaring dependencies in pyproject.toml is what lets the uv-only path resolve them from PyPI. To keep the conda paths behaving as before — and to avoid pip pulling PyPI wheels over conda-provided binaries such as healpy and netCDF4 — the conda paths now pass --no-deps.

env.yml is unchanged; it remains the dependency source for the conda paths.

Notes

• uv is not installed in the dev environment used here, so Option 3 was not executed end to end; the commands are standard uv usage.

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