Move samples to .cs and .vb files

[mikeebowen]

This pull moves .vb and .cs samples to their own files and fixes some formatting and linting issues in the samples.

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[twsouthwick]

@mikeebowen I had disabled the nullable support for now (since the samples were old and we can do code clean up in a separate change) via https://github.com/OfficeDev/open-xml-docs/blob/main/samples/Directory.Build.props.

[twsouthwick]

One of the changes to the samples that I forgot to document (but visible in the ones I updated) is switching them so you can just dotnet run -- [args] to try it out - meaning changing it to be an exe instead of a method. We can do it that in a subsequent change, just FYI

[twsouthwick]

also, I had intentionally set up the script to ask for the name so it can be shortened and concise - I'm not sure about just taking the title "how do i ..." - can you shorten them so that there's not so many extra words?

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[twsouthwick]

LGTM! Thanks @mikeebowen