Implement a delete method and state on the @web5/api Record cla…

…ss (#635)

This PR Allows a `Record` class to include a `deleted` state based on a `RecordsDeleteMessage` being applied to it.

We update the `RecordModel` to reflect the immutable properties that a record may contain, as well as the optional mutable properties that are only relevant to a record that is in a non-deleted state.

When a record is in a deleted state, it derives the immutable properties from the `initialWrite` of that record.

Currently when dealing with a remote DWN, the user cannot be notified of a deleted state through a Query, however when Subscriptions are brought up to the API a user could receive a message from the remote which signals that the record has been deleted, more useful scenario testing will be implemented when `record.subscribe()` feature is added.

- Implements a `delete()` method on the `Record` class that behaves similarly to `update()`.
- Implements a `deleted` property on the `Record` class to indicate if the record is in a deleted state.

.changeset/eighty-spoons-cross.md

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+Implement a `delete` method and state on the `@web5/api` `Record` class