Add analyzer for Environment.ProcessPath

[jkotas]

Environment.ProcessPath API introduced by #40862 is a significantly more efficient replacement of Process.GetCurrentProcess().MainModule.FileName. This pattern is quite common. We should add analyzer and fixer for this.

More context: #42768 (comment)

[Dotnet-GitSync-Bot]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[Serg046]

I'll do it, guess it should be there https://github.com/dotnet/roslyn-analyzers/tree/master/src/NetAnalyzers/Core/Microsoft.NetCore.Analyzers/Runtime.
While I'm preparing a PR, you can suggest an analyzer key, name, etc (otherwise we will discuss it in scope of the PR)

[jkotas]

Thank you @Serg046 !

The naming and structure of this analyzer should mirror the naming and structure of the existing UseEnvironmentProcessId analyzer. It may be idea a good idea to just add handling of this pattern to the existing analyzer - see #42768 (comment) and #42768 (comment) for more context.

[terrajobst]

Video

Makes sense as proposed