feat: Fixes issue #382: Added support for More-Days week view

[Bonway]

Description

I saw that # 382 is open in Issues, and I have also encountered this issue.
Add multi day view mode on the basis of weekly view

• Modify WeekView to add the daysInView attribute daysInView==7, with the same logic as before, only when daysInView != 7. Enable it to support multi day views
• Modify PageController to slide for multiple days
  
  
  
  

Checklist

• The title of my PR starts with a [Conventional Commit] prefix (fix:, feat:, docs: etc).
• I have followed the [Contributor Guide] when preparing my PR.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples or docs.

Breaking Change?

• Yes, this PR is a breaking change.
• No, this PR is not a breaking change.

Related Issues

Indicate which issues this PR resolves, if any. For example:
Closes #382