rmgpy.kinetics.surface.pyx needs its own to_cantera_kinetics() implementation

[sevyharris]

Motivation or Problem

There are some cases where we would like to convert from a SurfaceArrhenius kinetics object to Cantera kinetics, but the to_cantera_kinetics() function doesn't work because the units are different.

Specifically, the rmgpy.tools.canteramodel.py could use this function for loading surface models in Cantera.
See the CanteraModel.load_model() method around line 300.

I came across this while working on #2514

Desired Solution

We should implement the to_cantera function for all of the surface kinetics objects, which should just be a matter of copying the function from the regular gas-phase version and changing the acceptable units.

Potential Alternatives

I've already found a workaround for the canteraModel problem for regression testing, but it's very inconsistent to have a piece of the kinetics object working for gas phase and not surface phase.

[github-actions]

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