adaptors: add stripe adaptor

[hunterachieng]

Summary

• Implement list() and get() functions for stripe.
• Implement http.get(), http.post(), and http.request() namespaced functions.

Fixes #1304

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• Does the PR do what it claims to do?
• If this is a new adaptor, added the adaptor on marketing website ?
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  production? Is it safe to release?
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  dev only changes don't need a changeset.
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