Refactor: Use psi_initializer instead of wavefunc

[Qianruipku]

Refactor psi_initializer
Remove wavefunc and wf_atomic
Fix #5811

[kirk0830]

@Qianruipku Hi, qianrui. I am happy to see you are trying to use psi_initializer in SDFT. Here I share some information and my findings in previous days when I was trying to make it available on GPU.

1. There is a bug/ a hidden undefined behavior in function random_t that will be triggered in case nspin 4. The energy will vary in a random manner if you run with MPI. To detect this, you can run the integrated test case 140_PW_15_SO.
2. Because I use smart pointer to manage the projected NAO in psi_initializer to ensure the large piece of memory is safely released when program runs out of life span of psi_initializer instance, it is not directly feasible to make it run on GPU, and I am considering roll back to use raw pointer (although regret to say it is a unsafe choice...), but not manage to find enough time to do this.

Regards.