feat: add to_value and from_value functions.

[zicklag]

Description

Adds to_value() and from_value() functions along with corresponding ValueSerializer and ValueDeserializer structs, which can be used to convert between a Rust struct that implements Serialize/Deserialize and a dasl::drisl::Value.

Breaking Changes

None

Notes & open questions

My use-case was wanting to have a Rust wrapper type that contained a DRISL Value in it and could be deserialized without needing to know the details of the inner type.

But then later I would need to take that Value and deserialize it into a specific Rust type. Letting you deserialize directly from the Value saves a round-trip through the CBOR encoding.

I added a couple small test-cases, but they are far from exhaustive.

Change checklist

• Self-review.
• Documentation updates following the style guide, if relevant.
• Tests if relevant.
• All breaking changes documented.

[b5]

@zicklag thanks for this! can you take a look at the CI failures? would love to review once we're green, or help debug as needed. Taking a look at the failures it looks like pretty basic stuff