LCAO refactor Step 4：Eliminate the LCAO_hamilt.cpp file and related class

[mohanchen]

Describe the Code Quality Issue

The LCAO_hamilt.cpp was not adapted to current framework of the LCAO line. Most of the functions in the file are now only used for generating H-related matrices with the sparse format. Therefore, a series of spar_.cpp and spar_.h files are desinged instead in the LCAO code directory.

Additional Context

No more.

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.