Added support for views to Get-DacColumn command

[yorickbouma]

• Decided not to use parametersets since we would lose the ability to use the command in an unnamed matter
• Doubted between Object or a more meaningful name for the argument (TableOrView?)
• Introduced an alias for backwards compatibility

@abbgrade let me know if you want any changes

[abbgrade]

Hi @yorickbouma ,
Thank you for your contribution and please excuse the slow response.
About your decisions: I would have chosen the same options.