Update Invoke-Paginate and Invoke-PaginateSearch

[yannick-beot-sp]

• Use Default parameter values (for $Increment, $InitialOffset, and $Limit)
• Remove $InitialOffset parameter as not used in Invoke-PaginateSearch
• Use of ArrayList instead of Array for more efficient concatenation
• Use of PSCustomObject for $Results for easier completion
• Use of validation in parameters
• Bugfix of "return" too early in Invoke-PaginateSearch