Add session token to AWS bedrock

[shoopapa]

The default configuration of the bedrock provider doesn't account for session tokens, sessionTokens are common in local AWS environments and should be supported by default

[tmokmss]

jfyi you can use local credential or IAM role credential directly by setting bedrockOptions instead.

For example.

import { createAmazonBedrock } from '@ai-sdk/amazon-bedrock';
import { streamText } from 'ai';

export const maxDuration = 30;

export async function POST(req: Request) {
  const { messages } = await req.json();

  const result = await streamText({
    model: createAmazonBedrock({ bedrockOptions: { region: 'us-east-1' } })('anthropic.claude-3-haiku-20240307-v1:0'),
    messages,
  });

  return result.toAIStreamResponse();
}

[shoopapa]

jfyi

Thanks! I noticed that after I finished this code change lol I still feel like it makes sense to merge in. seems like most of the other providers just work without configuring

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[lgrammel]

Continued in #2755