Create TeradataProvider.cs

[nathanbaker]

Adding support for Teradata

[pleb]

Thanks for the PR.

Is there a docker image for this DB? The reason I ask is that I'd like to figure out how easy/hard it would be to add integration tests

[nathanbaker]

That's a good idea, it seems this page has docker-images for Teradata

https://github.com/Teradata/docker-images

I can have a look into it and get back to you.

[pleb]

Sorry it's been so long. I've looked and they still don't have docker images. All I could find was a VMware image on the TeraData website. The TeraData website is a nightmare to navigate. Then I tried to find the documentation to read for TeraData database itself. To cut a long story short, I've given up. I'm going to leave this PR here encase somebody comes along and can make use of it. I really only want to support DBs I can run via docker so that I can run integration tests against them