Add support for Bedrock Flows

[msalehan]

Describe the feature you'd like
Adding support for Bedrock Flows would greatly enhanced usefulness of the solution. Right now there are 2 options: text (simple prompting) and agents (autonomous). Bedrock flows allow for defining a specific workflow that has to be taken for each use case. An example is retrieving a specific S3 file based on the prompt and using the contents in an LLM call.

Additional context
N/A

[ihmaws]

Thanks for the report @msalehan , the team will evaluate the request and have a look to see where this might fit into our upcoming road map!