Initialize-PodeOpenApiTable fails to initialize OpenAPI table when DefaultDefinitionTag param is Null

[mdaneri]

Fix for #1406
Added a new sample for the Use-PodeAuth function

Description of the Change

New sample for the Use-PodeAuth function
Initialize-PodeOpenApiTable now is checking if $DefaultDefinitionTag param is $null and by default assign the value 'default'

function Initialize-PodeOpenApiTable {
    param(
        [string]
        $DefaultDefinitionTag
    )
    # Check if the provided definition tag is null or empty. If so, set it to 'default'.
    if ([string]::IsNullOrEmpty($DefaultDefinitionTag)) {
        $DefaultDefinitionTag = 'default'
    }

    # Initialization of the OpenAPI table with default settings
    # Create a hashtable named $OpenAPI to hold various OpenAPI-related configurations and data.
    $OpenAPI = @{
        # Initialize a stack to manage the Definition Tag selection.
        DefinitionTagSelectionStack = [System.Collections.Generic.Stack[System.Object]]::new()
    }

    # Set the currently selected definition tag to the provided or default tag.
    $OpenAPI['SelectedDefinitionTag'] = $DefaultDefinitionTag

    # Initialize the Definitions dictionary with a base OpenAPI object for the selected definition tag.
    # The base OpenAPI object is created using the Get-PodeOABaseObject function.
    $OpenAPI['Definitions'] = @{ $OpenAPI['SelectedDefinitionTag'] = Get-PodeOABaseObject }

    # Return the initialized OpenAPI table
    return $OpenAPI
}

Related Issue

#1406