* feat(azure/prompt_shield.py): initial commit adding prompt shield guardrail + auto discovery mechanism for guardrails
reduces amount of code needed outside of guardrail integration for instrumentation
* feat(azure/prompt_shield.py): working azure prompt shield guardrail integration
Addresses https://github.com/BerriAI/litellm/issues/12254
* test: unit tests for prompt_shield
* fix(prompt_shield.py): add event hook validation for prompt shield guardrail
ensures prompt shield guardrail raises error if asked to run post_call (only runs on user prompt)
* feat(azure/): working text_moderation integration
* fix(text_moderation.py): suppress linting error
* test(test_azure_text_moderation.py): add unit test
* test(test_azure_text_moderation.py): add unit test for responses
* fix(text_moderation.py): return streaming error correctly
ensures error returned to user
* fix: fix linting error
* fix: fix linting check
* test: change mistral model
service tier exceeded
* fix(exception_mapping_utils.py): cover mistral in exception mapping
* Move PANW Prisma AIRS test per feedback on PR #12116
- Move test to tests/test_litellm/proxy/guardrails/guardrail_hooks/
* Remove test file from old location
