feat: v2 migration Cloudflare KV

[chris13524]

Description

Prepares for the Verify Server V2 migration by mirroring all attestation writes to Cloudflare KV. Also reads attestations from Cloudflare KV if not found in Redis.

Remaining work:

• What is the status code/response for a key not found?
• Add CF API bearer token TF Cloud secret
• Tests Already covered by integration tests + tested manually
• Merge https://github.com/WalletConnect/cloud-app/pull/1233
• Remove unnecessary CF API key & TF secrets

How Has This Been Tested?

Due Diligence

• Breaking change
• Requires a documentation update
• Requires a e2e/integration test update

[xDarksome]

No need to fix any of this, just for the future

Liking the composability of the abstractions already? 😄

[xDarksome]

attestation_store -> http_server dependency really stinks, but oh well it's going to be deprecated anyway 😄

[chris13524]

Liking the composability of the abstractions already?

Actually they constrained what I wanted to implement: I wanted to call the regular get attestation endpoint from the worker, but this did an additional lookup on the data lake API which would've added latency and be redundant with the lookup that's being done here. If the abstraction wasn't so strong it probably would've been easier to use the response from the worker exclusively and disable the redundant lookup here.

Instead I made a new endpoint on the worker that didn't do the data lake call so that it would fit into the AttestationStore abstraction.