[Inference Providers] Async calls for fal.ai (#2927)
* add async calls for fal-ai
* fix
* fix test
* nit
* pass request params to get response
* fixes
* nit
* fix quality
* nit
* fixes post-review
* fix
Co-authored-by: Lucain <lucain@huggingface.co>
* remove unnecessary type: ignore
Co-authored-by: Lucain <lucain@huggingface.co>
* fix
Co-authored-by: Lucain <lucain@huggingface.co>
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Co-authored-by: Lucain <lucain@huggingface.co>
