Write record to KV

[francois-potato]

Context

Currently, there is no way to list all instances of a Durable Object (via Cloudflare API or the runtime API). This could be problematic because we won't have a way to retrieve all records in case we need to.

A solution is to use alongside Durable Object, Cloudflare KV.

Scope of this ticket

• When creating or updating an IPNS record DO, also write to KV
  • The key is the IPNS k5 key, the value is a JSON serialisation of the record data
• Add tests

Acceptance criteria

• [ ] When publishing an IPNS record, the record should be saved as a DO and in KV

[adamalton]

In the adam-durable-object-test branch (1f5e5aa0242d53df1d1369919ac787daf9f38329) I've done a proof of concept to show that we can query for a list of all Durable Objects. So we don't need to use the KV store to keep a list of the records, so I'm closing this.