feat: Pull Requests: Integrate ReSharper CLI

[ProgrammingByPermutation]

Not a ton of great free code quality scanning tools. Resharper CLI is decent.

https://www.jetbrains.com/help/resharper/ReSharper_Command_Line_Tools.html#install-and-use-resharper-command-line-tools-as-net-core-tools

Pull requests should run the cli with a "good" configuration for the code scanning and report back status. Dealers choice on what is an "appropriate" level to fail on and what rules are set to what. Defaults are a good start.

I don't know if we can make it "unmergeable" because we can't use the branch protections to prevent PRs from being merged. This might have to be a "be on your best behavior and handle all PRs through forks" kinda situation for the time being...