Implement TryFromIntError conversion for AnchorError

[CanardMandarin]

I noticed it was a bit painful to cast integers with try_into and try_from because you have to either unwrap() or map_err(||).

What about implementing TryFromIntError for Error so we can use the ? operator?

[vercel[bot]]

@CanardMandarin is attempting to deploy a commit to the coral-xyz Team on Vercel.

A member of the Team first needs to authorize it.

[CanardMandarin]

Sure! I have added a test case.

[CanardMandarin]

My bad, I should have thought about it!

[CanardMandarin]

Feel free to modify the changelog entry if the description is not clear.