[Dependency] Operator layer `source_hamilt` depending back on electronic state/methods

[Critsium-xy]

Describe the Code Quality Issue

• Symptom:
  • module_xc/* includes estate/module_charge/charge.h (libxc_pot.cpp, xc_functional.h, libxc_tools.cpp);
  • module_xc/exx_info_*.h includes lcao/module_ri/conv_coulomb_pot_k.h;
  • includes pw/module_pwdft/structure_factor.h.
• Fix:
  • apply dependency inversion for charge: define an abstract PotBase/density interface in the hamilt layer, have estate implement it, and let hamilt hold only an interface pointer;
  • the EXX-config dependency on RI (which lives in lcao) needs restructuring: move the RI-coupled parts of exx_info up to the method layer / esolver;
  • inject structure_factor from above.
• Acceptance: cut hamilt ↔ estate and hamilt → lcao/pw.

Additional Context

No response

Task list for Issue attackers (only for developers)

• Identify the specific code file or section with the code quality issue.
• Investigate the issue and determine the root cause.
• Research best practices and potential solutions for the identified issue.
• Refactor the code to improve code quality, following the suggested solution.
• Ensure the refactored code adheres to the project's coding standards.
• Test the refactored code to ensure it functions as expected.
• Update any relevant documentation, if necessary.
• Submit a pull request with the refactored code and a description of the changes made.