Add PipelineIndentationStyle.None option for scenarios where indentation is custom, inconsistent or the user does not like any of the 3 pipeline indentation styles

[bergmeister]

#1330 PR Summary

Add PipelineIndentationStyle.None option for scenarios where indentation is custom, inconsistent or the user does not like any of the 3 pipeline indentation styles.

Originally suggested by @vexx32 at the time when the rule was a bit buggy.

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.