Refactor: generalize the rule to switch the io backend of abacuslite

[kirk0830]

Reminder

• Have you linked an issue with this pull request?
• Have you added adequate unit tests and/or case tests for your pull request?
• Have you noticed possible changes of behavior below or in the linked issue?
• Have you explained the changes of codes in core modules of ESolver, HSolver, ElecState, Hamilt, Operator or Psi? (ignore if not applicable)

Linked Issue

Fix #7268

Unit Tests and/or Case Tests for my changes

• A unittest is added to the interfaces/ASE_interface/abacuslite/core.py

What's changed?

• I generalize the rule of switching the i/o parsing backend of abacuslite according to issue Question: what the format of version number will be for LTS in the future? #7260

Any changes of core modules? (ignore if not applicable)

• No

[mohanchen]

LGTM