fix: add missing exports with Cardano prefix

[SebastienGllmt]

The package is missing these type exports, which makes it hard to work with the library

[SebastienGllmt]

I'm assuming you're fine with just re-exporting everything with a Cardano prefix

If you really don't like this, you could make that all the Cardano types are instead exported under @utxorpc/sdk/cardano using conditional exports, but given Cardano is the only chain supported at the moment it might not be worth spending time on this now

[Mercurial]

I agree with this, we can revisit later once we have more chains avaialble.

[SebastienGllmt]

I noticed after this PR was merged that the ChainPoint exported here is actually just a JSON-friendly copy of a separate type (that is a class and not a json object) also called ChainPoint

You can import the class version by doing

import type { query } from "npm:@utxorpc/spec";

const point: query.ChainPoint // use it like this

I still need the ChainPoint exported like in this PR (i.e. we shouldn't revert this PR) because

1. There is no type-safe way to go from the class to the JSON type provided by utxorpc as far as I know
2. There isn't even a way to do the transformation properly dynamically either as per the issue mentioned here: test: add initial unit tests #38 (comment)