Shall we include a Hydrogen fuel as one of the eligible fuels for thermal generators?

[pesap]

Is there any value of us to add Hydrogen as one of the fuels for thermal generators? Currently if someone wants to capture thermal generators that use hydrogen they need to use either OTHER_GAS or other. However, there is definitely a grown in popularity on Hydrogen. I think there is some value on including it as one of the ENUM values for filtering purposes or for custom constraints by fuel type in the future.

cc @jd-lara @claytonpbarrows

Reference:

• https://nrel-sienna.github.io/PowerSystems.jl/stable/api/enumerated_types/#tf_list