Add Amazon Bedrock Integration

[julian-risch]

Summary and motivation

As a user, I'd like to use models on Amazon Bedrock in my Haystack 2.0 pipelines. This was brought up in deepset-ai/haystack#6545

Detailed design

A new generator class for Amazon Bedrock with the same features as the 1.x version, which was implemented as an invocation layer. All currently available models on Bedrock should be supported and streaming should be supported for all models that support streaming. For example, we should be able to load Llama 2 Chat 13B model:

from amazon_bedrock_haystack.generators import AmazonBedrockGenerator
generator = AmazonBedrockGenerator(model_name_or_path="meta.llama2-13b-chat-v1")

Related PRs for the support in Haystack 1.x were deepset-ai/haystack#6226 and deepset-ai/haystack#6406

Checklist

If the request is accepted, ensure the following checklist is complete before closing this issue.

• The code was merged in the main branch
• Docs are published at https://docs.haystack.deepset.ai/
• There is a Github workflow running the tests for the integration nightly and at every PR
• A label named like integration:<your integration name> has been added to this repo
• The labeler.yml file has been updated
• The package has been released on PyPI
• An integration tile for Amazon Bedrock haystack-integrations#104
• The integration has been listed in the Inventory section of this repo README
• [Amazon Bedrock] Amazon Bedrock example to demonstrate the feature #173
• Amazon Bedrock: The feature was announced through social media #226

[dfokina]

Docs are published: https://docs.haystack.deepset.ai/v2.0/docs/amazonbedrockgenerator

[lambda-science]

Excited to see AWS Bedrock in Haystack 2.0. The generator looks implemented, I was wondering if there was an issue to follow the implementation of the AmazonBedrockEmbedder (implmented in 1.x) :)

Thanks !

[julian-risch]

The issue for the embedder is here: #181 but at the moment nobody is working on it. Just let us know in case you would like to contribute! 🙂