Apply expansion for material composition changes

[mgjarrett]

What is the change?

When a composition is updated, check to see if this change affects the thermal expansion properties of the material. If it does, clear the cache to allow volumes to be recomputed and apply a scaling factor to the number densities to conserve mass.

Why is the change being made?

Material properties can be dependent upon the composition of a material. When the composition of a material changes from depletion (or anything else), the thermal expansion properties can change, which causes a change in volume. This change looks like thermal expansion, but caused by a change in composition rather than a change in temperature. To accurately conserve mass throughout a simulation, it is beneficial to check for this type of expansion any time a composition changes and adjust the number densities accordingly.

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Checklist

• This PR has only one purpose or idea.
• Tests have been added/updated to verify any new/changed code.

• The code style follows good practices.
• The commit message(s) follow good practices.

• The release notes have been updated if necessary.
• The documentation is still up-to-date in the doc folder.
• The dependencies are still up-to-date in pyproject.toml.