Support file scoped namespace declarations when generating code

[304NotModified]

🤔 What's changed?

Generated file scoped namespaces when set in .editorconfig

Normally "create" generates this:

namespace MyNamespace.StepDefinitions
{
    [Binding]
    public class CalculatorStepDefinitions
    {
        [Given("the first number is {int}")]
        public void GivenTheFirstNumberIs(int p0)
        {
            throw new PendingStepException();
        }

With

# C# files
[*.cs]
csharp_style_namespace_declarations = file_scoped:suggestion

We get this:

namespace MyNamespace.StepDefinitions;

[Binding]
public class CalculatorStepDefinitions
{
    [Given("the first number is {int}")]
    public void GivenTheFirstNumberIs(int p0)
    {
        throw new PendingStepException();
    }

In VS config:

⚡️ What's your motivation?

Keep the code style from the editorconfig.

🏷️ What kind of change is this?

• ⚡ New feature (non-breaking change which adds new behaviour)

♻️ Anything particular you want feedback on?

📋 Checklist:

• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "[vNext]" section of the CHANGELOG, linking to this pull request & included my GitHub handle to the release contributors list.

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[304NotModified]

This is ready for review. I tested it locally and added snapshot tests :)

[gasparnagy]

I've scanned it through and it looks cool! I'll make a more detailed review during my holidays.