Add IndentByTwo attribute indent style option for Razor formatting

[Copilot]

Summary of the changes

Adds IndentByTwo to AttributeIndentStyle enum, enabling users to indent component attributes by two levels instead of one, visually distinguishing them from child elements.

Changes:

• Added IndentByTwo enum value to AttributeIndentStyle.cs
• Updated CSharpFormattingPass.CSharpDocumentGenerator.cs to handle three indent styles using explicit if-else logic
• Added "Indent by two levels" resource string to VSPackage.resx
• Extended VS configuration in razor.registration.json to expose the new option
• Added test coverage in DocumentFormattingTest.cs

Example:

<TheNameOfMyComponent Param1="One"
        Param2="Two"
        Param3="Three">
    <Child1/>
    <Child2/>
</TheNameOfMyComponent>

Attributes indent 2 levels (8 spaces), children indent 1 level (4 spaces).

Warning

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Desired Razor formatting changes</issue_title>
<issue_description>As per this suggestion by @davidwengier this issue is to request the ability to specify how much indentation to use for Blazor component's Parameters in razor markup when they are on a new line.

I like to format my code like this

<TheNameOfMyComponent Param1="One"
        Param2="Two"
        Param2="Three">
    <Child1/>
    <Child2/>
</TheNameOfMyComponent>

Children are indented with 1 tab, and parameters on subsequent lines indented with 2 tabs (to differentiate them from child components).

Could we please have an option to enable us to specify indentation size for parameters on new lines?</issue_description>

<agent_instructions>Add a new attribute indent option for "IndentByTwo" and implement
</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Desired Razor formatting changes #12699

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[ToddGrun]

to differentiate them from child elements.

comment needs updating

[ToddGrun]