AWS Bedrock Converse Integration

[jaketothepast]

Is your feature request related to a problem? Please describe.
No

Describe the solution you'd like
.chat for AwsBedrock calls the InvokeModel operation. Why not call Converse which is built for this and available in the AWS SDK?

Additional context
Having problems getting .chat to work for me, system prompts do not work as part of the messages flow. Was digging through the code and noticed that .chat doesn't call AWS purpose-built Bedrock operation for this use case.

[Roy-Gal-Git]

It's impossible to use newer models (such as sonnet 4.5) on AWS Bedrock because of the current implementation of chat.

#1031

[Roy-Gal-Git]

@jaketothepast I forked the repo and added support for the converse API.
Feel free to use it until you migrate to a different gem 😄
https://github.com/Roy-Gal-Git/langchainrb/releases/tag/0.20.1