feat(bedrock): Temporary AWS credentials via env vars + supported models update

[JGalego]

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Features

• Added support for temporary credentials
• Added support for AWS credentials via environment variables (AWS_*)
  • https://github.com/geekan/MetaGPT/issues/1174#issuecomment-2096092836
• Updated supported models and corrected max tokens
  • New models
    • (AI21) Jamba-Instruct
    • (Amazon) Titan Text Premier
    • (Cohere) Command R & R+
    • (Mistral) Mistral Large 2
  • Legacy/EOL
    • (AI21) J2 Mid & Ultra for us-west-2
    • (Meta) Llama 2 (--> Llama 3/3.1)

Example

1. Add MetaGPT config

llm:
  api_type: 'bedrock'
  model: "amazon.titan-text-premier-v1:0"
  # 🔔 No need to add the access_key or secret_key!

2. Configure AWS Credentials

export AWS_ACCESS_KEY_ID=...
export AWS_SECRET_ACCESS_KEY=...
export AWS_SESSION_TOKEN=...
export AWS_DEFAULT_REGION=us-east-1

3. Call MetaGPT

metagpt "Create a 2048 game"

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Codecov Report

Attention: Patch coverage is 20.93023% with 34 lines in your changes missing coverage. Please review.

Project coverage is 62.50%. Comparing base (ab846f6) to head (47be4f5). Report is 28 commits behind head on main.

Files with missing lines	Patch %	Lines
metagpt/provider/bedrock/bedrock_provider.py	14.70%	29 Missing :warning:
metagpt/provider/bedrock_api.py	33.33%	4 Missing :warning:
metagpt/provider/bedrock/utils.py	50.00%	1 Missing :warning:

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1450      +/-   ##
==========================================
- Coverage   62.59%   62.50%   -0.09%     
==========================================
  Files         287      287              
  Lines       17589    17622      +33     
==========================================
+ Hits        11009    11015       +6     
- Misses       6580     6607      +27     

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[JGalego]

@usamimeri @Wei-Jianan as authors of Bedrock-related PRs, would you mind reviewing these changes? cc: @geekan

[better629]

lgtm