[Calendar] calendar skill refactor part 1

[KayMKM]

Purpose

Part 1 of refactor calendar skill.
Refactor state. Split the variables in state to these categories: basic, meeting information, show meeting information, update meeting information.

Changes

refactor CalendarSkillState and change related dialogs.

Tests

Yes

Feature Plan

finish the tasks that listed in #2142

Checklist

General

• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the appropriate tests
• I have updated related documentation

Bots

• I have validated that new and updated responses use appropriate Speak and InputHint properties to ensure a high-quality speech-first experience
• I have replicated language model changes across the English, French, Italian, German, Spanish, and Chinese .lu files and validated that deployment is successful

Deployment Scripts

• I have replicated my changes in the Virtual Assistant Template and Sample projects
• I have replicated my changes in the Skill Template and Sample projects