LiteLLM Minor Fixes + Improvements (#5474)

* feat(proxy/_types.py): add lago billing to callbacks ui

Closes https://github.com/BerriAI/litellm/issues/5472

* fix(anthropic.py): return anthropic prompt caching information

Fixes https://github.com/BerriAI/litellm/issues/5364

* feat(bedrock/chat.py): support 'json_schema' for bedrock models

Closes https://github.com/BerriAI/litellm/issues/5434

* fix(bedrock/embed/embeddings.py): support async embeddings for amazon titan models

* fix: linting fixes

* fix: handle key errors

* fix(bedrock/chat.py): fix bedrock ai21 streaming object

* feat(bedrock/embed): support bedrock embedding optional params

* fix(databricks.py): fix usage chunk

* fix(internal_user_endpoints.py): apply internal user defaults, if user role updated

Fixes issue where user update wouldn't apply defaults

* feat(slack_alerting.py): provide multiple slack channels for a given alert type

multiple channels might be interested in receiving an alert for a given type

* docs(alerting.md): add multiple channel alerting to docs

.pre-commit-config.yaml

@@ -1,12 +1,12 @@
 repos:
 -   repo: local
     hooks:
-    # -   id: mypy
-    #     name: mypy
-    #     entry: python3 -m mypy --ignore-missing-imports
-    #     language: system
-    #     types: [python]
-    #     files: ^litellm/
+    -   id: mypy
+        name: mypy
+        entry: python3 -m mypy --ignore-missing-imports
+        language: system
+        types: [python]
+        files: ^litellm/
     -   id: isort
         name: isort
         entry: isort