Unique meaningful hash ID for PhysicalProperties

[lilyminium]

Is your feature request related to a problem? Please describe.

Can PhysicalProperties be assigned a unique ID based on the hash of their contents? Currently I believe when downloaded from ThermoML they get a random UUID which is difficult to compare between datasets.

Describe the solution you'd like

Hash a tuple of (property type, substance, thermodynamic state, value, error, source), and any other attrs/columns that distinguish two properties. This will run into false mismatches from precision differences but it will be much more comparable than random UUIDs.

Describe alternatives you've considered

Additional context

[mattwthompson]

Probably could; would lean towards including more attributes than less as I'd rather have unnecessary mismatches than accidental collisions