🪨 feat: add session token variable for AWS Bedrock (#4896)

Author: philwilliammee

.env.example

@@ -119,6 +119,7 @@ BINGAI_TOKEN=user_provided
 # BEDROCK_AWS_DEFAULT_REGION=us-east-1 # A default region must be provided
 # BEDROCK_AWS_ACCESS_KEY_ID=someAccessKey
 # BEDROCK_AWS_SECRET_ACCESS_KEY=someSecretAccessKey
+# BEDROCK_AWS_SESSION_TOKEN=someSessionToken
 
 # Note: This example list is not meant to be exhaustive. If omitted, all known, supported model IDs will be included for you.
 # BEDROCK_AWS_MODELS=anthropic.claude-3-5-sonnet-20240620-v1:0,meta.llama3-1-8b-instruct-v1:0