refactor: add streaming output to office agent

[GavinGu07]

This PR is to enable Office agent to output in different skills to improve the user experience

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.03%. Comparing base (2805b7e) to head (a9362e8).
Report is 50 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #11863      +/-   ##
==========================================
+ Coverage   88.71%   89.03%   +0.32%     
==========================================
  Files         547      556       +9     
  Lines       32980    33061      +81     
  Branches     6325     6499     +174     
==========================================
+ Hits        29257    29437     +180     
+ Misses       1772     1693      -79     
+ Partials     1951     1931      -20     

Files	Coverage Δ
...on/src/officeChat/commands/create/officeSamples.ts	96.15% <100.00%> (ø)
.../vscode-extension/src/officeChat/common/planner.ts	92.06% <100.00%> (+0.12%)	⬆️
...sion/src/officeChat/common/skills/codeGenerator.ts	95.33% <100.00%> (+0.09%)	⬆️
...-extension/src/officeChat/common/skills/printer.ts	100.00% <ø> (ø)

... and 31 files with indirect coverage changes