Add more test conditions for chem kinetics

[tulioricci]

• Split test_eos and move chemical kinetics tests to test_chemistry
• Add extra chemistry verification at different pressure conditions
• Add verification of species entropy and Gibbs energy (used under the hood in reversible reactions)
• Add lewis=1.0 test option to test_transport
• Explicitly export the mechanism and read it back for better assessment of test coverage in test_eos, test_chemistry and test_transport
• Tried to remove deprecation warns from Pyrometheus but left as a comment instead. Need Update EOS drivers_y3-prediction#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?