feat(lookup): handle Cloudflare DDoS protection

[neatchee]

Description

Resolves #1297

• Move response handling to a function that can be called recursively
• Check 503 responses for Cloudflare's "attribution" div + link text
• If we hit a Cloudflare page, do page.waitForNavigation and then call response handling again (recursively)

Testing

Set store = "zotac"
Set brand & model = ""
Set series = "3070, 3080, 3090"
Run and observe output

Prior result: Frequent 503 errors due to Cloudflare protection

New result: Periodic "CLOUDFLARE, WAITING" message followed shortly by success (typically OUT OF STOCK)

[neatchee]

I'm not bad at git, you're bad at git >.>

[jef]

Amazing! Thank you very much for this. This is really going to be a big quality of life!