feat: TDDFT-ris store Tia Tij Tab in RAM

[John-zzh]

1. Add option to store Tia Tij Tab in RAM.
2. cleanup the tensor initialization logic
3. merge zhichen's get_ab function into new structure
4. replace krylov_tools.krylov_solver to replace Davidson
5. an example for preconditioned TDA with ~2 speedup.

TODO:

1. implement krylov_solver for ABBA situations.

[sunqm]

upper_inv_eri2c = lower_inv_eri2c[intopt._aux_ao_idx, intopt._aux_ao_idx[:,None]]

[John-zzh]

Amazing broadcasting and indexing... I have not fully understand the mechanism but I did test out that lower_inv_eri2c[intopt._aux_ao_idx, intopt._aux_ao_idx[:,None]] does not need an extra transpose :-)

[sunqm]

The value of this parameter and some of the parameters (spectra, out_name, etc.) are not printed anywhere. They can be logged in the build() function. Some attributes like n_occ, n_vir should also be dumped into the log at INFO level

[John-zzh]

yes, n_occ, n_vir and many other attributes are printed out in build()