Mixture EOS and chemistry updates + three-body reactions fix

[tulioricci]

Pyrometheus had bugs in entropy and three-body reactions, yielding wrong reaction rates. Need to point to https://github.com/pyrometheus/pyrometheus/pull/76 as the pyrometheus branch. Apparently, no more issues with #945

Update/organize test_eos, including different kinds of reactor that yield fixed pressure or fixed density. The latter exercises (formerly missing) pressure-dependent terms in the reactions.

Simplify documentation in eos.py by using annotations.

Complains about cv argument in gas_const following https://github.com/illinois-ceesd/mirgecom/pull/970#discussion_r1394508049 .

Remove deprecated functions in thermochemistry. Add an option in thermochemistry to compute temperature without Newton iteration for constant cp/cv/gamma,with the respective test in test_eos. Includes constant gamma mechanism by MikeA.

Moves mix-avg transport test from test_eos.py to the new file test_transport.py

Depends on https://github.com/illinois-ceesd/drivers_y3-prediction/pull/53

Questions for the review:

• [ ] Is the scope and purpose of the PR clear?
  • [ ] The PR should have a description.
  • [ ] The PR should have a guide if needed (e.g., an ordering).
• [ ] Is every top-level method and class documented? Are things that should be documented actually so?
• [ ] Is the interface understandable? (I.e. can someone figure out what stuff does?) Is it well-defined?
• [ ] Does the implementation do what the docstring claims?
• [ ] Is everything that is implemented covered by tests?
• [ ] Do you see any immediate risks or performance disadvantages with the design? Example: what do interface normals attach to?

[anderson2981]

I think it should be fine, only minor changes to what I"m doing to support the api changes.