Implement Initializer expression wrappers

[tokarzkj]

Users will now be offered refactoring options for collection initializers. The implementation was modelled after the AbstractSeparatedSyntaxList implementation. This applies to visual basic and c#.

There are 3 choices for users:

1. Wrap every element

// Before
var example = new[] { 1, 2 };

// After
var example = new[] 
{
    1,
    2
};

2. Unwrap every element

// Before
var example = new[] 
{
    1,
    2
};

// After
var example = new[] { 1, 2 };

3. Wrap long

// Before
var example = new[] { 1, 2 };

// After
var example = new[]
{
    1, 2
};

Resolves #37428

[CyrusNajmabadi]

"arguments"?

[tokarzkj]

Whoops, I thought I changed that. I was going to look at removing these sub labels too unless you think they would be better left in. But, as of now each refactoring only has one option and that seems pointless.

[CyrusNajmabadi]

CSharpInitializerExpressionWrapper

[CyrusNajmabadi]

@jasonmalinowski i believe this community PR is ready for team review. thanks!

[jasonmalinowski]

@CyrusNajmabadi, yep, it's on my list along with seemingly everybody else's. Should get to it in a day or two.

[CyrusNajmabadi]

Thanks @jasonmalinowski !

[sharwell]

📝 Note that this feature needs to coordinate with the code style from #54859. Since this PR is much older, it seems like it should merge first and then we update #54859 to make the necessary changes there.

[sharwell]

I'm working on resolving the merge conflicts...

[CyrusNajmabadi]

i recommend reviewing with whitespace off.