feat: port to using np.random.Generator

pyproject.toml

test/test_callables.py

test/test_diff.py

test/test_einsum.py

test/test_expression.py

test/test_fusion.py

test/test_loopy.py

test/test_reduction.py

test/test_scan.py

test/test_target.py

test/test_transform.py