Code formatter should keep indentation for multi-line pipelines

[daviwil]

Currently for a block of code like this:

Get-Process |
    Where WS -gt 500mb |
    Format-Table VM, WS, CPU, ID, ProcessName

the code formatter gives this output:

Get-Process |
Where WS -gt 500mb |
Format-Table VM, WS, CPU, ID, ProcessName

It should at least retain the proper indentation or fix it if we notice that the following lines in the pipeline are indented.

/cc @Jaykul