Fix the overwriting between xc kernel components

[maki49]

Fix the problem that XC_LDA_C_PZ overwrites XC_LDA_X in LR-TDDFT.

Si2, lda, gamma (eV)	singlet1	singlet2	singlet3	triplet1	triplet2	triplet3
CP2K	2.21*3	2.27*3	3.24	1.31*2	1.4	1.69*3
ABACUS-before	2.616*3	2.704*3	4.21	2.236*3	2.24*3	2.42
ABACUS-fixed	2.17*3	2.29*3	3.37*2	1.34	1.37*2	1.75*3

[dyzheng]

The code changes in this PR are relatively simple and clear, with a style consistent with the module_lr module. While there is a difference from the main code style of other modules, this part of the code is relatively independent, and therefore I still recommend accepting it. Suggestions for developers include: 1. memory usage should be as cautious as possible, and manual release should be performed promptly after use. 2. There are multiple occurrences of OMP parallel divisions in the code; since each allocation of OMP tasks requires time, it might be worth considering reducing the number of OMP divisions.

[kirk0830]

Because files changed in this PR requires the knowledge of libxc, in which many quantities are defined with names commonly seen in libxc, like sigma, ..., So I prone not leave quite many comments on variables' name.
There is one minor suggestion:
I notice you have many simple numerical operations that can be omp-paralleized, a better way to organize your codes can be write several functions like:

void _customize_op1(const std::vector&, ..., ...);

in those functions you implement conditional omp threading, and follow the present coding regulation that do not write for-loop in one-line manner (because human reads line from the left to right, in your code the control of for-loop/bound will be the first to read, which is not the most important information of one for-loop block, instead, the vectorized data being iterated on, and operations are two the most important information. This is the essence of functions like std::transform, std::for_each in aspect of code-readability, as far as I understand) to improve the code readability:
Do not write a for-loop like:

for (int i = 0; i < bound; i++) {/* do something */}

Instead, your write like:

for (int i = 0; i < bound; i++)
{
    /* the thing really important */
}