Support strong name .pfx signatures

_This issue has been moved from [a ticket on Developer Community](https://developercommunity.visualstudio.com/content/problem/901856/f-projects-fail-to-build-with-strong-name-signatur.html)._

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Need to add support for strong name signing via pfx files in the .fsproj files. In any C# project you have a "signing" tab which is just a wrapper around the MSBuild arguments SignAssembly and AssemblyOriginatorKeyFile. All you need to do is similarly expose these flags.

```csproj

true

strongname.pfx

```

If you try to force it via the `--keyfile:strongname.pfx` flag in the OtherFlags, it throws an exception. If you try to link it via an `[]`, it throws an exception.

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### Original Comments

#### Visual Studio Feedback System on 2/3/2020, 04:42 AM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

#### Visual Studio Feedback System on 3/5/2020, 07:42 PM:

I have detected that for the last 35 days, this issue didn't have much product team activity and a very small amount of new votes or comments. Based on this, its severity, and affected area, it’s my experience that this issue is very unlikely to be fixed.

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### Original Solutions
(no solutions)