feat: walkthrough for intelligent apps

[LongOddCode]

https://msazure.visualstudio.com/Microsoft%20Teams%20Extensibility/_workitems/edit/26356860/
A new walkthrough for building intelligent apps

[codecov]

Codecov Report

Attention: Patch coverage is 88.46154% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 88.42%. Comparing base (20d61ba) to head (c58ba2c).

Additional details and impacted files

@@           Coverage Diff            @@
##              dev   #11578    +/-   ##
========================================
  Coverage   88.41%   88.42%            
========================================
  Files         535      537     +2     
  Lines       32632    32677    +45     
  Branches     6287     6481   +194     
========================================
+ Hits        28853    28895    +42     
+ Misses       1837     1836     -1     
- Partials     1942     1946     +4     

Files	Coverage Δ
packages/fx-core/src/index.ts	100.00% <100.00%> (ø)
packages/vscode-extension/src/constants.ts	100.00% <100.00%> (ø)
...s/vscode-extension/src/controls/openWelcomePage.ts	100.00% <100.00%> (ø)
packages/vscode-extension/src/handlers.ts	74.74% <100.00%> (+0.22%)	⬆️
...code-extension/src/telemetry/extTelemetryEvents.ts	100.00% <100.00%> (ø)
...kages/vscode-extension/src/handlers/walkthrough.ts	92.30% <92.30%> (ø)
...scode-extension/src/handlers/checkCopilotAccess.ts	81.48% <81.48%> (ø)