[formatter] Comment to let formatter ignore contents

Summary of the new feature

A common feature of formatter is to ignore formatting for rest of lines/range of lines with special comments.
I propose this feature because formatting rules in pssa are rather bold, you can't get a finer control on the style, so ignoring certain part can save my code from being messed up.

# ignore a range of lines

# pssa: ignore format start
echo foo
echo bar
# pssa: ignore format end

# ignore the rest of lines

# pssa: ignore format
echo foo

Proposed technical implementation details (optional)

What is the latest version of PSScriptAnalyzer at the point of writing

I don't know, I use powershell-editor-services

issue 中没有列出 formatter 的文件、测试或入口点。首先定位 PSScriptAnalyzer formatter 的实现及其对注释的处理方式，然后检查现有的 formatter 测试。完成的标准是支持提议的范围标记，以及忽略后续所有行且不对其中代码进行格式化的单条注释。