Added generic Gemini chat and more example applications

[mtabacman]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 92.14502% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.43%. Comparing base (0190d4c) to head (d483070).
⚠️ Report is 11 commits behind head on release-candidate.

Files with missing lines	Patch %	Lines
source/Sairen-Gemini/GeminiChat.class.st	79.01%	17 Missing ⚠️
...rce/Sairen-Examples/SairenCodingAssistant.class.st	47.05%	9 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           release-candidate       #6      +/-   ##
=====================================================
+ Coverage              82.21%   85.43%   +3.21%     
=====================================================
  Files                     12       20       +8     
  Lines                    804     1112     +308     
=====================================================
+ Hits                     661      950     +289     
- Misses                   143      162      +19     

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