Feature: add interface Gint::psir_func
          #5380
        
          
      
                
     Merged
            
            
          
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Add two function objects
psir_funcinGint, changing the NAOpsir_ylmtopsir_ylm_new = psir_func (psir_ylm)when calculategint_rho()andgint_vl().It's an interface for the future development. To the existing codes, it's just
psir_ylm_new = psi_ylmas default .