nucleation model version 2022 implementation

[BoZeng1997]

Reason

Implement nucleation model 2022 version in paper https://link.springer.com/article/10.1007/s10704-022-00653-z

Design

One detail not mentioned in the paper, the compressive part of the external driving force should be a linear term of the phase field variable. The code will implement the linear version.

[lyyc199586]

will you just update the old NucleationMicroForce file?

[BoZeng1997]

yes. I dont think Gary will accept a new object

[lyyc199586]

then should we also keep 2020 model as an option to choose? like we could choose to use 2020 or 2022 model as an option in this file?

[BoZeng1997]

yes. I have done it. I will commit it for review once I have better commented the code

[lyyc199586]

great!