feat: Add badModel with color-triggered error behaviors

[gingerknight]

Issue #, if available: n/a

Notes

Implements a new model that can simulate a variety of common errors based on an

Changes

• New badModel with color-based behavior triggering
  • Server error simulation (red dominant color)
  • Malformed JSON response simulation (green dominant color)
  • RFC7946 schema violation simulation (purple dominant color)
  • Timeout simulation (blue dominant color)
  • Normal detection fallback for other colors

Files Added/Modified

• src/aws/osml/models/badModel/app.py - Main badModel application with error simulation
• src/aws/osml/models/badModel/__init__.py
• test/aws/osml/models/badModel/test_badModel_model.py - Model unit tests

Impact

• Provides controlled failure simulation for integration testing

Checklist

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• Code changes are compact and well-structured to facilitate easy review
• Changes are documented in the README.md and other relevant documentation pages
• PR title and description accurately reflect the changes and are detailed enough for historical tracking
• PR contains tests that cover all new code and the code has been manual tested
• All new dependencies are declared (if any), and no unnecessary libraries are added
• Performance impacts (if any) of the changes are evaluated and documented
• Security implications of the changes (if any) are reviewed and addressed
• I have read the Contributing Guidelines and agree to follow the Code of Conduct

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[jtblack-aws]

We should update the README as part of this change. Specifically this part

Note: The MODEL_SELECTION environment variable can be used to pick the model to run. Currently, 
we support 3 different types of a model and below are the appropriate naming convention:
- centerpoint
- flood
- aircraft

We don't currently do this, but a short sentence describing the purpose of each would be helpful if we are updating it anyway.