add ruff to repo

[simsaidan]

Resolves #31

[cursor]

Bugbot is not enabled for your account, so this pull request was not reviewed.

Enable Bugbot in the Cursor dashboard to get automatic reviews on future PRs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
shadowsim/benchmarking/benchmark.py	100.0% <100.0%> (ø)
shadowsim/core/combined_hamiltonian_matrix.py	100.0% <100.0%> (ø)
shadowsim/core/hamiltonian.py	100.0% <100.0%> (ø)
shadowsim/core/hamiltonian_set.py	100.0% <100.0%> (ø)
shadowsim/core/local_hamiltonian.py	100.0% <100.0%> (ø)
shadowsim/core/local_operator.py	100.0% <100.0%> (ø)
shadowsim/core/operator.py	100.0% <100.0%> (ø)
shadowsim/core/operator_set.py	100.0% <100.0%> (ø)
shadowsim/core/pauli.py	100.0% <100.0%> (ø)
shadowsim/core/pauli_string.py	100.0% <100.0%> (ø)
... and 18 more

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.