Decouple Formatter.GetFormattedTextChanges from Workspaces to allow using it in an analyzer

[HellBrick]

This is basically a continuation of #7929. The use case here is I want to be able to check if the code formatting satisfies the specific formatting settings and provide warning + code fix if it doesn't. Formatter.GetFormattedTextChanges seems like the way to go here, but unfortunately it's part of Microsoft.CodeAnalysis.Workspaces, which can't be used in an analyzer without producing tons of warnings on build.

As discussed in the issue I've mentioned, I'd like to suggest refactoring out a version of this method that doesn't need Workspace, operates only on SyntaxNode and an instance of formatting settings and resides in an assembly that can be used safely both during build and in VS.

[JackJCSN]

Maybe you can try like this:

var oraginalText = context.Tree.GetText(cancellationToken);
var formatedText = context.Tree.GetRoot(cancellationToken).NormalizeWhitespace().GetText();

var changes = formatedText.GetTextChanges(oraginalText);
foreach (var change in changes)
{
    var diagnostic = Diagnostic.Create(Rule, context.Tree.GetLocation(change.Span));
    context.ReportDiagnostic(diagnostic);
}

[CyrusNajmabadi]

Needs to have a full API request that can go through teh API process.