Feature idea: AvoidLongLines

[rjmholt]

Summary of the new feature

@Jaykul said it best (in PowerShell/vscode-powershell#517):

a rule that gave a warning on lines longer than 120char, but an information on all commands with more than one parameter

Proposed technical implementation details (optional)

Issue a warning for CommandParameterAsts with an extent beyond line offset 120 (or information if it's the only parameter).

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

1.18

[rjmholt]

Closed in #1329