Example: Hubbard SC with RPA

[iintSjds]

• provide functions to compute and load RPA kernel from triqs_tprf
• compute linear response function with MC

[kunyuan]

Related resources:

1. Solving the linearized Eliashberg equation in the random phase approximation limit
   https://triqs.github.io/tprf/latest/user_guide/Linearized%20Eliashberg%20equation%20on%20the%20attractive%20Hubbard%20model.html
2. Linearized Eliashberg equation on the attractive Hubbard model
   https://triqs.github.io/tprf/latest/user_guide/Linearized%20Eliashberg%20equation%20on%20the%20attractive%20Hubbard%20model.html
3. Linearized Eliashberg Equation
   https://triqs.github.io/tprf/latest/theory/eliashberg.html
4. Solving the linearized Eliashberg equation in the random phase approximation limit
   https://triqs.github.io/tprf/latest/user_guide/Solving%20the%20linearized%20Eliashberg%20equation%20in%20the%20random%20phase%20approximation%20limit.html