Necessary imports should be added when inlineHints are applied

[JoeRobich]

Double clicking inline hints which replace var with a type name do not add using directives when necessary.

Steps to Reproduce:

1. Create a new console app
2. Add a new class named OtherClass.cs with the following:

using System.Collections.Immutable;

namespace ConsoleApp;

internal class OtherClass
{
    public static ImmutableDictionary<string, string> GetNameMap()
        => ImmutableDictionary<string, string>.Empty;
}

3. Replace the code in Program.cs with the following:

var nameMap = ConsoleApp.OtherClass.GetNameMap();

4. With inline type hints for var enabled you should see the following:

5. Double click the inline type hint to apply the text to the document.

Expected Behavior:
var is replaced with ImmutableDictionary<string, string> and a using System.Collections.Immutable; using directive is added.

Actual Behavior:
var is replaced with ImmutableDictionary<string, string>? which is error squiggled.

Additional Thoughts:
The VS Code implementation of this behavior supports associating multiple TextEdits with each inlay hint. Currently Roslyn supports a single TextEdit.

[CyrusNajmabadi]

Closing out due to lack of feedback.