feat: Add Amazon Bedrock as LLM provider

[ebaizel]

Relates to

#2753

Risks

Low risk: the changed code should only impact a runtime when Amazon Bedrock is used as a provider. Otherwise, the existing code should not be impacted.

Background

What does this PR do?

It adds Amazon Bedrock as an LLM provider, making available the Amazon Nova family of LLMs, as well as LLMs from several other providers.

What kind of change is this?

Feature (non-breaking change which adds functionality)

Why are we doing this? Any context or related work?

Some developers may have credits or tokens that can only be consumed via AWS (Amazon Bedrock), and this offers them an opportunity to use those.
Also, Amazon Nova models are cost-effective, intelligent models that could be well-suited for Eliza agents.

Documentation changes needed?

My changes do not require a change to the project documentation.

Testing

I created a character and set the model to nova-micro, and verified I could generate text that then got included as a tweet.

Where should a reviewer start?

The two main new pieces of functionality are in generateText and generateObject.

Detailed testing steps

To test generateText, set a character to use one of the Bedrock models (eg, nova-lite-v1). Then start the character and ask it something, which will then lead it to invoke generateText

NOTE: I could use help testing out the generateObject functionality.

Discord username

pixel_pavel

[github-actions]

Hi @ebaizel! Welcome to the ai16z community. Thanks for submitting your first pull request; your efforts are helping us accelerate towards AGI. We'll review it shortly. You are now a ai16z contributor!

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