Feature request: types for the values returned by "hre.artifacts.readArtifact"

Fantastic work with the v5 addition of typings to the "getContractFactory" function - [I added them](https://github.com/paulrberg/solidity-template/blob/3def942b3ae779e491627837d4837b21c138e9d1/scripts/deploy.ts) to my Solidity template.

In a similar fashion, it would be nice to have bespoke types for the values returned by the `readArtifact` function offered by Hardhat. After all, there is a limited number of artifacts that Hardhat can pick up from the "artifacts" folder. See [this line](https://github.com/paulrberg/solidity-template/blob/main/test/Greeter.ts#L22) for an example for how the `readArtifact` function is used.