Minimize-LCAO-Memory: `hRGint` and `DMRGint`

[dyzheng]

Describe the Code Quality Issue

In test of large scale LCAO base case, such as Si512 , the memory records of hRGint and DMRGint looks much larger than hR and DMR , the difference derived from the parallel method of FFT-grid.

I guess a more suitable FFT-Grid parallel partitioning algorithm will help to save memory.

Additional Context

No response

Task list for Issue attackers (only for developers)

• Identify the specific code file or section with the code quality issue.
• Investigate the issue and determine the root cause.
• Research best practices and potential solutions for the identified issue.
• Refactor the code to improve code quality, following the suggested solution.
• Ensure the refactored code adheres to the project's coding standards.
• Test the refactored code to ensure it functions as expected.
• Update any relevant documentation, if necessary.
• Submit a pull request with the refactored code and a description of the changes made.