fix: rename clone diff size field, remove pointers from clone fields (#122)

Description

• rename clone diff size field
• remove pointers from clone fields

Related issue

#122 (closed)

Examples

...
    "metadata": {
        "cloneDiffSize": 479232,
        "cloningTime": 2.892935211,
        "maxIdleMinutes": 0
    },
...

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes, specifications reflect those changes and they have been reviewed OR there are no API changes

Closes #122 (closed)