introduce capture destination option

[mkumatag]

This PR supports the different options for capture destinations

following new field is been added to the capture filed

destination (string) - The destination determines how the image is captured. Options: ('image-catalog', 'cloud-storage', 'both'). The default is 'cloud-storage'.
if image-catalog is specified then cos field content will be ignored

e.g:

....
    "builders": [
        {
            "type": "powervs",
....
.....
            "capture": {
                "name": "target-image-1",
                "destination": "image-catalog"
            }
        }
    ],
.....

post this run, you will see something like below:

$ ibmcloud pi image ls
ID                                     Name              Address
85c30fc5-2d25-4b40-95b5-932201bacc65   CentOS-Stream-9   /pcloud/v1/cloud-instances/e943af9c58c04143a7035c52b6d27c16/images/85c30fc5-2d25-4b40-95b5-932201bacc65
f1eb1728-72e9-4b2f-9a01-62756a264d56   target-image-1    /pcloud/v1/cloud-instances/e943af9c58c04143a7035c52b6d27c16/images/f1eb1728-72e9-4b2f-9a01-62756a264d56

[ppc64le-cloud-bot]

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This pull-request has been approved by: mkumatag

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