`sql::Value` is an integral part of `surrealdb`. It's the internal type used by our storage layer. Because of this, we do a lot of converting between this type and native Rust types. Currently this conversion is done through `JSON` using the `serde_json` crate because we do not have our own custom data format implementation. This works because `SQL` is a superset of `JSON`. This, however, means that this conversion is lossy and can cause surprises in some cases. For example expecting record IDs to be deserialized into a `String` instead of its corresponding Rust native type.
This change implements a custom data format around `sql::Value` and introduces a `to_value` function that facilitates that conversion.
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