Add JigsawStack provider for TTS and STT

[iamNarcisse]

This PR adds Text-to-Speech (TTS) and Speech-to-Text (STT) functionalities using the JigsawStack AI SDK in src/jigsawstack.ts.

Key changes:

• Added module imports and type definitions.
• Created a jigsawstack object with TTS and STT functions.
• Introduced TranscribeWithUrlOptions and transcribeWithUrl in src/index.ts to support transcription via audio URLs.
• The necessary tests for both TTS and STT functionalities

@haydenbleasel

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Name	Status	Preview	Comments	Updated (UTC)
orate	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 29, 2025 10:25pm

[haydenbleasel]

Hey @iamNarcisse, thanks for the PR! I added the docs and updated the website. I think the key issue we'll have in accepting this is that audio.speech_to_text only takes a URL. Every other provider takes a File / Buffer / ArrayBuffer and we'll need that to keep the interface uniform.