Use PKCS8 PEM, not raw SEC1 bytes, to store VAPID keys.

The `web-push` crate's VAPID signing support requires a private key. The `p256` crate is more than capable of generating one, but the easiest way to get a key from a `p256::ecdsa::SigningKey` to a `web_push::PartialVapidSignature` is via PKCS #8 PEM, not via the bytes. Since we'll need it in that form anyways, store it that way, so that we don't have to decode it using `p256`, re-encode to PEM, then decode to `PartialVapidSignature`.

The migration in this commit invalidates existing VAPID keys. We could include support for re-encoding them on read, but there's little point: this code is still in flux anyways, and only development deployments exist. By the time this is final, the schema will have settled.

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