(feat proxy slack alerting) - allow opting in to getting key / internal user alerts (#5990)

* define all slack alert types

* use correct type hints for alert type

* use correct defaults on slack alerting

* add readme for slack alerting

* fix linting error

* update readme

* docs all alert types

* update slack alerting docs

* fix slack alerting docs

* handle new testing dir structure

* fix config for testing

* fix testing folder related imports

* fix /tests import errors

* fix import stream_chunk_testdata

* docs alert types

* fix test test_langfuse_trace_id

* fix type checks for slack alerting

* fix outage alerting test slack

.circleci/config.yml

@@ -16,15 +16,6 @@ jobs:
           command: |
             echo "Git commit hash: $CIRCLE_SHA1"
 
-      - run:
-          name: Check if litellm dir was updated or if pyproject.toml was modified
-          command: |
-            if [ -n "$(git diff --name-only $CIRCLE_SHA1^..$CIRCLE_SHA1 | grep -E 'pyproject\.toml|litellm/')" ]; then
-              echo "litellm updated"
-            else
-              echo "No changes to litellm or pyproject.toml. Skipping tests."
-              circleci step halt
-            fi
       - restore_cache:
           keys:
             - v1-dependencies-{{ checksum ".circleci/requirements.txt" }}