Add get clip route

[alifhughes]

• Added route to get information of a clip (an extension) via an ID
• I think I've added to all the necessary places in the docs, but let me know if I've missed somewhere

Would be accessed by api like

async def get_clip(clip_id):
    url = f"{BASE_URL}/api/clip?id={clip_id}"
    async with httpx.AsyncClient() as client:
        response = await client.get(url, headers={'Content-Type': 'application/json'}, timeout=100)
    return response.json()

[vercel]

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[swumagic]

hei,guys. i updata 75+79 have many bug-deployment to vercel（#75 Add get clip route and #79 Add concat endpoint to "get whole song" from an extension ）#81 #81, How to fix it, thank you !