Upgrade to JAX 0.7.0

[leakec]

JAX 0.7.0 requires hashable types for the keyword args to H. This means we can no longer use numpy arrays. These could be refactored to be tuples.

To do this, we need to make modifications to Python and C++. I'm curious if this is the time where we should bite off switching from swig to pybind11. pybind11 has better typing support, and since we are only binding from C++ to python (not C++ to other languages) it would make sense.

To Dos:

• Cap version at 0.6 for JAX for current release so something at least works when you install via PyPI.
• Switch from swig to pybind11.
• Change to using tuples rather than numpy arrays for H.
• Make sure docs build. Can update these to build TFC too, since cmake should be supported.
• Check that the full test suite (not just the normal one) passes after this change.
• Release.

[leakec]

Test builds

• Linux worked fine as expected.
• Mac OS had issues with std::format. This is in a non-hot code path, and will only run during an error, so I decided to just switch to std::stringstream instead to make it happy.
• Windows is having trouble finding the dll coming out of pybind11. Need to look into this.

[leakec]

All tests passed on 04b1840

No other significant changes expected, just minor tweaks to build with Windows. Should not need to re-run.

[leakec]

Released in https://github.com/leakec/tfc/releases/tag/tfc-v1.3.0