Add image support for Bedrock

[AgentT30]

Description

Adds support for images on Bedrock provider. Added a method to convert images from OpenAI format to Bedrock format.
This implements #625

PR Type

🆕 New Feature

Relevant issues

Implements #625

Checklist

• I have added unit tests that prove my fix/feature works
• New and existing tests pass locally
• Documentation was updated where necessary
• I have read and followed the contribution guidelines```

[codecov]

Codecov Report

❌ Patch coverage is 71.87500% with 9 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/any_llm/providers/bedrock/utils.py	70.96%	6 Missing and 3 partials ⚠️

Files with missing lines	Coverage Δ
src/any_llm/providers/bedrock/bedrock.py	67.27% <100.00%> (-23.64%)	⬇️
src/any_llm/providers/bedrock/utils.py	30.56% <70.96%> (-45.98%)	⬇️

... and 39 files with indirect coverage changes

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