added tools support for fireworks.ai

[2hy6v]

(as requested reopened from #4046)

Description

Added support for tools for the models who support tooling running via fireworks.ai.
Its also using openai api with some quirks.
Left behind explanation in comment section.

https://docs.fireworks.ai/guides/function-calling

Testing instructions

If one wanted to do so:

1. Check if tooling still works with other providers (I have no other providers available to me, but the changes are just a few lines and I don't think anything can go wrong here)
2. Use fireworks.ai as provider with and check if tooling works (it does for me now)

Todo

Proper versioning, idk how you guys handle this nor if I should have done anything in that regard since its my first contribution. I could not find anything regarding that in the Contributing.md

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[sestinj]

thanks for re-opening!

[pczekaj]

@2hy6v this change breaks o3-mini when continue dev operates in agent mode and tools are enabled, continue sends parallel_tool_calls and in response gets

400 Unsupported parameter: 'parallel_tool_calls' is not supported with this model.

in the past I fixed it with https://github.com/continuedev/continue/pull/4062/files but this PR reverted it back