Big-endian array fields in compound datasets

[axelboc]

• https://h5web.panosc.eu/h5grove?file=epics.h5
• /arrays/Vdata with mixed types

"type": {
  "class": "Compound",
  "fields": {
    // ...,
    "Integer Array": {
      "class": "Array",
      "base": {
        "class": "Integer",
        "signed": true,
        "endianness": "big-endian",
        "size": 32
      },
      "dims": [4]
    },
    "Float Array": {
      "class": "Array",
      "base": {
        "class": "Float",
        "endianness": "big-endian",
        "size": 32
      },
      "dims": [20]
    }
  }
}

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