Refactor/reschedule

[ishiko732]

Related issues:

• Considerations for review logs in a distributed database #112
• [Question] What's the usage of reschedule? #125

close : #125

The reschedule method will consider the following scenarios:

1. Allow rescheduling from the beginning/first_card.
2. Reschedule based on reviews.
3. Provide a reschedule_item when the due time of the reschedule card differs from the current_card.
4. Allow skipping manual revlog and opt not to update fsrs_memory_state.
5. Use now to determine the time of rescheduling.
6. Ensure correct rescheduling even when due or forget is manually specified.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (5de8318) to head (594d658).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #127   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        12    +1     
  Lines          609       650   +41     
  Branches        64        70    +6     
=========================================
+ Hits           609       650   +41     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ishiko732]

This refactor only modifies the reschedule method, thus only the minor version will be updated.

[L-M-Sherlock]

LGTM