Modernize type annotations, require __future__ annotations

arraycontext/__init__.py

arraycontext/container/dataclass.py

arraycontext/context.py

arraycontext/fake_numpy.py

arraycontext/impl/__init__.py

arraycontext/impl/jax/__init__.py

arraycontext/impl/jax/fake_numpy.py

arraycontext/impl/numpy/fake_numpy.py

arraycontext/impl/pyopencl/fake_numpy.py

arraycontext/impl/pyopencl/taggable_cl_array.py

arraycontext/impl/pytato/compile.py

arraycontext/impl/pytato/fake_numpy.py

arraycontext/impl/pytato/utils.py

arraycontext/loopy.py

arraycontext/metadata.py

arraycontext/pytest.py

arraycontext/transform_metadata.py

arraycontext/version.py

doc/make_numpy_coverage_table.py

pyproject.toml