feat(fireworks): Enable model listing support in FireworksProvider

[njbrake]

Description

PR Type

🆕 New Feature ## 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

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/any_llm/providers/fireworks/fireworks.py	71.42%	2 Missing ⚠️

Files with missing lines	Coverage Δ
src/any_llm/providers/fireworks/fireworks.py	30.27% <71.42%> (-49.54%)	⬇️

... and 25 files with indirect coverage changes

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