Add a Rename-PSResourceRepository cmdlet

Summary of the new feature / enhancement

Currently the only way to rename a resource repository is to first unregister and then register it again. To make this easier for the user please introduce a Rename-PSResourceRepository.

Proposed technical implementation details (optional)

SYNTAX
    Rename-PSResourceRepository [-Name] <string> [-NewName] <string> [-PassThru] [-WhatIf] [-Confirm] [<CommonParameters>]

function Rename-PSResourceRepository {
    [CmdletBinding(SupportsShouldProcess)]
    param (
        [Parameter(Mandatory, Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName)]
        [string]
        $Name,

        [Parameter(Mandatory, Position = 1, ValueFromPipelineByPropertyName)]
        [string]
        $NewName,

        [Parameter()]
        [switch]
        $PassThru
    )
    
    process {
        if ($PSCmdlet.ShouldProcess($Name)) {
            # Rename repository
        }
    }
}

Start by reading the existing unregister and register resource repository cmdlets, since the issue identifies those as the current rename workflow. Add the proposed Rename-PSResourceRepository syntax and verify Name, NewName, PassThru, WhatIf, Confirm, and pipeline behavior; done means users can rename a repository without manually unregistering and registering it.