Move the VAPID public key encoding into a serde-compatible encoding module.

The [Serde attribute docs][serde-attr] don't spell out that this will work, but experimentally, it looks like a module used with `#[serde(with)]` only needs to have the `encode`/`decode` functions if they're actually used, and can be "incomplete" if the missing ones are also unused in your code. That's the case here: we serialize VAPID keys, but never deserialize them.

[serde-attr]: https://serde.rs/field-attrs.html#with

This improves organization a bit in my view, but more importantly it also sets us up for a coming change where we _will_ start deserializing VAPID keys, and where I'd like to use the same logic: giving it its own module will make that easier to organize.

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