Unified --Json output

[ArbaazKhan1]

addresses issue #6391

To make a universal --json flag I moved it from Fate and ServiceStatus and into ServerOpts so all commands inherit it. Added a new CommandOutputEnvelope class that will take accumulo JSON outputs and wraps them in an envelope for a unified output and a new CommandReport interface that report classes will inherit so they can produce both human-readable and computer readable lines. Started by wiring up fate --summary and service-status as the two proof-of-concept commands since both already have partial JSON support

[ArbaazKhan1]

What the Json output would look like for `accumulo inst service-status --json

{
  "command": "accumulo admin service-status",
  "version": "1.0",
  "reportTime": "2026-06-09T20:20:01Z",
  "status": "OK",
  "data": {
    "reportTime": "2026-06-09T20:20:01.889Z",
    "zkReadErrors": 0,
    "showHosts": false,
    "summaries": {
      "COMPACTOR": {
        "resourceGroups": {
          "default": 1
        },
        "serviceByGroups": {
          "default": [
            "localhost:9600"
          ]
        },
        "serviceCount": 1,
        "errorCount": 0
      },
      "GC": {
        "resourceGroups": {
          "default": 1
        },
        "serviceByGroups": {
          "default": [
            "localhost:9998"
          ]
        },
        "serviceCount": 1,
        "errorCount": 0
      },
      "MANAGER": {
        "resourceGroups": {
          "default": 1
        },
        "serviceByGroups": {
          "default": [
            "localhost:9999"
          ]
        },
        "serviceCount": 1,
        "errorCount": 0
      },
      "MONITOR": {
        "resourceGroups": {
          "default": 1
        },
        "serviceByGroups": {
          "default": [
            "localhost:9995"
          ]
        },
        "serviceCount": 1,
        "errorCount": 0
      },
      "S_SERVER": {
        "resourceGroups": {
          "default": 1
        },
        "serviceByGroups": {
          "default": [
            "localhost:9700"
          ]
        },
        "serviceCount": 1,
        "errorCount": 0
      },
      "T_SERVER": {
        "resourceGroups": {
          "default": 1
        },
        "serviceByGroups": {
          "default": [
            "localhost:9800"
          ]
        },
        "serviceCount": 1,
        "errorCount": 0
      }
    }
  }
}

[DomGarguilo]

Trying out some commands and things are looking good. I did find one discrepency that I think is caused by these changes. I tried accumulo inst service-status --json and realized the serviceByGroups field is printed even though it only should be when --showHosts is provided too. I think the logic that excludes that field from the output is broken now since the new envelope code serializes the ServiceStatusReport object directly instead of using its existing toJson() method. Probably need to update ServiceStatusReport.getData()