Format indention of multiline statements

Summary of the new feature

Enhance formatting of continued (multiline) statements (command and expression), combining the PipeLineIndentionStyle with statement continuation.

There are a lot of means to continue command statements, including pipe lines. especially so with expressions. I, myself, prefer all continued statements to be indented, but currently the formatting only supports indenting when a brace or parenthesis is involved, or optionally with a pipe line.

Proposed technical implementation details (optional)

I actually think the details of pipe line continuation gets simpler when the entire statement's continuation is taken in to account.

I am not fully understanding of how the formatting mechanism works, so this is a fundamental concept to how I would think it would work.

If using PowerShell AST's, for each PipeLineAst/CommandExpressionAst/etc, add 1 indention level to subsequent lines, in addition to all other indenting even for the same PipeLineAst.

There might be a need to restrict the continuation indention of a PipeLine or CommandExpression if they are the sole contents of a ParenExpression, because in that case, the PipeLine or CommandExpression is fully captured in the indention of the ParenExpression, as technically only one expression should appear in such cases, unlike a scriptblock or statementblock where multiple statements or expressions could appear.

I need to gather some examples to better demonstrate my use case.

没有指定文件或测试。首先定位格式化机制以及针对 PipeLineAst 和 CommandExpressionAst 的 PowerShell AST 处理；收集缺失的多行示例，然后将补全定义为一致的续行缩进，其中包括所述的带括号表达式区别，并编写覆盖该行为的测试。