Feature request: Convert to interpolated string code refactoring

Currently, there is a code refactoring to convert to verbatim string.

Another possible code refactoring (should only be offered when the string contains { and } is to convert to interpolated string.

Example

I wanted something like this while working with unit tests in roslyn and roslyn-analyzer codebases. So, here is an example. Suppose there is an existing unit test like the following

[Fact]
public void TestSomething()
{
    var code = @"
namespace Mynamespace
{
    public class Program
    {
        public static void Main() {Console.WriteLine();}
    }
}";
}

For some reason, I want to update the unit test to:

[Theory]
[InlineData("")]
[InlineData("string[] args")]
public void TestSomething(string mainArgs)
{
    var code = $@"
namespace Mynamespace
{{
    public class Program
    {{
        public static void Main({mainArgs}) {{Console.WriteLine();}}
    }}
}}";
}

It would be much easier to make this update if the IDE can offer a refactoring that converts the original code to the following:

var code = $@"
namespace Mynamespace
{{
    public class Program
    {{
        public static void Main() {{}}
    }}
}}";

[louis-z]

I came up with a new implementation, based on AbstractConvertConcatenationToInterpolatedStringRefactoringProvider and its derived classes (thanks @Youssef1313 for pointing me in the right direction 😉). I will submit a PR shortly.

[alenros]

If it makes any difference, I came here exactly because I expected “Convert to interpolated string” to do just that, precisely because I wanted it since I kept forgetting to add a $.