Allow templates usage for deviceregistration register command

[reubenmiller]

The following should be possible:

Piping a specific group (using filtering etc.), then register a manually given device id (external id):

c8y devicegroups list -p 1 | c8y deviceregistration register --id mytestdevice --template "{groupId: input.value.id}" --dry

But ideally the new Cumulocity groupId (see reference) should be supported.

c8y deviceregistration register --id mytestdevice --group

Workaround

c8y devicegroups list -p 1 \
| c8y api POST /devicecontrol/newDeviceRequests \
    --template '{id: "foo", groupId:input.value.id, type: "mytype"}'