Add species specification, complete documentation, and fix tempdir problem in double_enrich function

[kusurin]

Description

This pull request includes multiple changes to the double_enrich() function and documentation, as well as a bug fix.

Changes Made

1. feat: add species specification feature to double_enrich() function

2. docs: complete documentation for quick_enrich() and double_enrich() function

3. fix: avoid double_enrich() reading first result

   • Bug: The function double_enrich() was using the same temporary directory for each run, causing it to read the same result from first run.
   • Solution: Added a timestamp to the temporary directory path. This ensures that each run of the function creates a unique directory.

Testing

• Ensured that the function no longer reads results from previous runs.
• Tested the species specification feature to ensure it works as expected.

Please review the changes.