[Storage] az storage fs file list: Support --show-next-marker

[evelyn-ys]

Description

Feature requested by #16893

Testing Guide

• Before: Next_Marker only shows in warning message

> az storage fs file list -f ysfs --account-name yssaadls --num-results 1
Next Marker:
VBbOzIiisIvWrR4YOhg1L3lzc2FhZGxzATAxRDcxNjRFQzY2RDRGRjYveXNmcwEwMUQ3MTY0RjMxNjQyNDM1L2RpcjEWAAAA
[
  {
    "contentLength": 12,
    "etag": "0x8D8E9B5A72D28B0",
    "group": "$superuser",
    "isDirectory": false,
    "lastModified": "2021-03-18T02:29:27",
    "name": "123.txt",
    "owner": "$superuser",
    "permissions": "rw-r-----"
  }
]

• After: Next_Marker shows in results

> az storage fs file list -f ysfs --account-name yssaadls --num-results 1 --show-next-marker
[
  {
    "contentLength": 12,
    "etag": "0x8D8E9B5A72D28B0",
    "group": "$superuser",
    "isDirectory": false,
    "lastModified": "2021-03-18T02:29:27",
    "name": "123.txt",
    "owner": "$superuser",
    "permissions": "rw-r-----"
  },
  {
    "nextMarker": "VBbOzIiisIvWrR4YOhg1L3lzc2FhZGxzATAxRDcxNjRFQzY2RDRGRjYveXNmcwEwMUQ3MTY0RjMxNjQyNDM1L2RpcjEWAAAA"
  }
]

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[yonzhan]

Storage

[Juliehzl]

could you add preview for the flag in this sprint?

[evelyn-ys]

Sure. Done~