adapt.convertStorageSchemaToProto2Descriptor converts the names of RECORD type fields to lower case, which causes data not to be inserted if the data schema keeps the casing of the table

Environment details

• OS: any
• Node.js version: v18.6.0
• npm version: 9.6.6
• @google-cloud/bigquery-storage version: 3.4.0

Steps to reproduce

1. Create a table with a RECORD type column with any upper case letters.
   Example:

[
  {
    "name": "stringField",
    "type": "STRING",
    "mode": "NULLABLE"
  },
  {
    "name": "recordField",
    "type": "RECORD",
    "mode": "NULLABLE",
    "fields": [
      {
        "name": "recoredSubField",
        "type": "STRING",
        "mode": "NULLABLE"
      }
    ]
  },
  {
    "name": "repeatedField",
    "type": "RECORD",
    "mode": "REPEATED",
    "fields": [
      {
        "name": "repeatedSubField",
        "type": "STRING",
        "mode": "NULLABLE"
      }
    ]
  }
]

2. Adapt its schema to proto descriptor using adapt.convertStorageSchemaToProto2Descriptor and check the output:

  const {  adapt } = require('@google-cloud/bigquery-storage');
  const { BigQuery } = require('@google-cloud/bigquery');

  const bigquery = new BigQuery({ projectId});
  const dataset = bigquery.dataset(datasetId);
  const table = await dataset.table(tableId);
  const [metadata] = await table.getMetadata();

  const storageSchema = adapt.convertBigQuerySchemaToStorageTableSchema(
    metadata.schema
  );

  const protoDescriptor = adapt.convertStorageSchemaToProto2Descriptor(
    storageSchema,
    'InputData'
  );
  
  console.log(protoDescriptor)

Ouput:

  DescriptorProto {
  field: [
    FieldDescriptorProto {
      name: 'stringField',
      number: 1,
      type: 9,
      label: 1,
      options: [Object]
    },
    FieldDescriptorProto {
      name: 'recordfield',
      number: 2,
      type: 11,
      typeName: 'InputData_recordField',
      label: 1
    },
    FieldDescriptorProto {
      name: 'repeatedfield',
      number: 3,
      type: 11,
      typeName: 'InputData_repeatedField',
      label: 3
    }
  ],
...
}

Note that the STRING field stringField keeps its original casing in FieldDescriptorProto name, while recordField and repeteadField are converted to recordfield and repeatedfield.

Thanks!