Create Chemistry Diagnostic Table

[rrbuchholz]

New feature type

New table and/or analytic calculation

What is this new feature?

Evaluate chemistry mean values of select species.

Example of the old chemistry table is attached.

Assistance required?

Yes, I will need some assistance before making a PR

Extra info

chemistry diagnostic

[justin-richling]

Here is a progress report on the Chemistry tables so far: https://project.cgd.ucar.edu/projects/ADF/chem-diags/tables/html_table/amwg_table_Chemistry.html