[Feature]: Populate the namespaces with fields in builder.php when you make a stream

[edster]

Populate the namespaces with fields in builder.php when you make a stream and set the defaults here to be easily changed.

 'namespaces' => [
        'products' => [
            'name'        => [
                'hide_column' => FALSE,
                'hide_field'  => FALSE,
            ],
            'description' => [
                'hide_column' => FALSE,
                'hide_field'  => FALSE,
            ],
            'brand'       => [
                'hide_column' => FALSE,
                'hide_field'  => FALSE,
            ],
            'categories'  => [
                'hide_field'  => FALSE,
                'hide_column' => FALSE,
            ],
            'image'       => [
                'hide_field'  => FALSE,
                'hide_column' => TRUE,
            ]
        ],
        'brands'   => [
            'name'  => [
                'hide_field'  => FALSE,
                'hide_column' => FALSE,
            ],
            'image' => [
                'hide_field'  => FALSE,
                'hide_column' => TRUE,
            ]
        ]
    ],```