Add first set of baselines

[jnsbck]

This PR adds an initial set of baselines and verifies that baselines can be updated.

[jnsbck]

/update_regression_baselines

[github-actions]

Regression Baseline Update

✅ Process completed

test_runtime(num_cells=1, artificial=False, connect=False, connection_prob=0.0, voltage_solver=jaxley.stone)
🆕 build_time: (0.547s).
🆕 compile_time: (18.720s).
🆕 run_time: (2.817s).

test_runtime(num_cells=1, artificial=False, connect=False, connection_prob=0.0, voltage_solver=jax.sparse)
🆕 build_time: (0.317s).
🆕 compile_time: (3.107s).
🆕 run_time: (2.442s).

test_runtime(num_cells=10, artificial=False, connect=True, connection_prob=0.1, voltage_solver=jaxley.stone)
🆕 build_time: (1.628s).
🆕 compile_time: (29.477s).
🆕 run_time: (19.020s).

test_runtime(num_cells=10, artificial=False, connect=True, connection_prob=0.1, voltage_solver=jax.sparse)
🆕 build_time: (1.253s).
🆕 compile_time: (26.463s).
🆕 run_time: (25.086s).

test_runtime(num_cells=1000, artificial=True, connect=True, connection_prob=0.001, voltage_solver=jaxley.stone)
🆕 build_time: (110.895s).
🆕 compile_time: (45.626s).
🆕 run_time: (41.248s).

test_runtime(num_cells=1000, artificial=True, connect=True, connection_prob=0.001, voltage_solver=jax.sparse)
🆕 build_time: (108.675s).
🆕 compile_time: (60.998s).
🆕 run_time: (59.059s).

✨ Changes have been pushed directly to this PR

[michaeldeistler]

wuhuu, thanks a lot!