Refactor: change variables naming under context of Agent Framework

[SuZhou-Joe]

Description

1. Change variable names from sessionId to conversationId.
2. Change file names from session-related to conversation-related.

Issues Resolved

#96

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test.
• New functionality has user manual doc added.
• Commits are signed per the DCO using --signoff.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e278a47) 93.14% compared to head (69c7a47) 95.29%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
+ Coverage   93.14%   95.29%   +2.15%     
==========================================
  Files          46       46              
  Lines        1255     1255              
  Branches      298      300       +2     
==========================================
+ Hits         1169     1196      +27     
+ Misses         84       57      -27     
  Partials        2        2              

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[SuZhou-Joe]

Did a regression test on:

• Ask Chatbot and get response
• Loading conversations and conversation
• Showing how was it generated
• Change conversation title
• Delete conversation
• Search conversation
• Regenerate interaction
• Give feedback on interaction
• Save to Notebook
• Render data grid