Refactor: Remove global dependence of descriptor, orbital_precalc, v_delta_precalc in DeePKS.

[ErjieWu]

Unit Tests and/or Case Tests for my changes

• Add unittest for function cal_gdmepsl() in DeePKS.
• Change the reference file to suit the new data structure, see comment in Refactor: Remove global dependence of descriptor, orbital_precalc, v_delta_precalc in DeePKS. #5808.

What's changed?

• Move functions and variables related to descriptor from LCAO_deepks to DeePKS_domain in DeePKS.
• Split the function of force and stress calculations cal_gdmx() in DeePKS into two separate functions cal_gdmx() and cal_gdmepsl(), rearrange the calculation related to DeePKS in FORCE_STRESS.cpp to make it same as other parts for force&stress calculations.
• Remove the global dependence of orbital_precalc and v_delta_precalc in DeePKS and put their functions together in deepks_orbpre.cpp and deepks_vdpre.cpp.
• Use accessor for tensor to accelerate the access/modify of torch::Tensor variables.
• Remove LCAO_deepks_mpi.cpp since the function allsum_deepks() is no longer used now.