AI Chat handoff

[Bunn]

Task/Issue URL: https://app.asana.com/0/1204167627774280/1209119202522826/f

Description:
Add handoff support using the C-S-S communication layer

Steps to test this PR:
This feature depends on some FE changes in the SERP, so to test it you'll need to do a bit of initial setup:

1. Use this privacy config
2. Host this locally and expose it via ngrok (the config file above is setup to allow the ngrok-free domain, feel free to adjust if you're using something else)
3. Apply this patch which will: Remove the webview callback from within the AI Chat custom view, setup the ngrok URL

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1. Open the test website, tap on "open with payload". Validate that the AI chat view displays a large payload
2. Open the test website, tap on "open without payload". Validate that the AI chat view display null payload
3. Open the test website, tap on "open with random payload". Validate that the AI chat view display a random payload each time (Do this a couple times)
4. When doing the above, you can also validate if the payload is correctly consume by tapping on "Update settings".

[github-actions]

	Warnings
⚠️	PR has more than 500 lines of code changing. Consider splitting into smaller PRs if possible.

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