tiberius Fix todo panic

This PR adds an Unimplemented to the Error enum to indicate something that is not implemented, in place of todo! in the code.

todo! causes an error in the programme and it is very difficult to catch it, the reason for submitting this PR is that I did encounter it and I couldn't do anything about it, it would just interrupt the execution of the programme.

thread 'tokio-runtime-worker' panicked at 'not yet implemented: not yet implemented for Udt', .../src/tds/codec/type_info.rs:317:26
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

I know this is not good practice, but it can serve as a transition period. Until we fix all the todo, then remove it!

Thanks, tiberius

Sep 01 '23 09:09 wyhaya

It seems that the Tiberius repository is no longer active. Is it possible for this PR to be merged?

Dec 02 '23 17:12 wyhaya

Not with failing tests, of course. Get them passing - and we can consider.

Dec 02 '23 19:12 janpio

@janpio I've reviewed the tests, but the test failures are not caused by this PR.

https://github.com/wyhaya/tiberius/actions/runs/7072461970

Dec 02 '23 21:12 wyhaya