Improve image pull output rendering in `microcks start`

[Syedowais312]

Reason/Context

Problem

microcks start currently prints raw Docker image pull JSON logs directly to the terminal.

Example:

{"status":"Downloading","progressDetail":{...}}
{"status":"Extracting","progressDetail":{...}}

This floods the terminal and makes the output difficult to read.

Description

Expected Behavior

Image pull progress should be rendered in a cleaner Docker-style format (progress bars/status updates) instead of raw JSON output.

Possible Fix

Use Docker's JSON message renderer (jsonmessage.DisplayJSONMessagesStream) instead of directly streaming the pull output to stdout.

Implementation ideas

No response