chore: rename 'aws' to 'bedrock'

[njbrake]

Description

Prep for #183 by first renaming aws to bedrock.

PR Type

💅 Refactor ## Relevant issues

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

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/any_llm/provider.py	85.71% <100.00%> (ø)
src/any_llm/providers/bedrock/__init__.py	100.00% <100.00%> (ø)
src/any_llm/providers/bedrock/bedrock.py	59.18% <100.00%> (ø)
src/any_llm/providers/bedrock/utils.py	26.98% <ø> (ø)

... and 21 files with indirect coverage changes

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