/utils/csvUpload

This module exports the default csvUpload method for mapp utils module.

This utility supplies a way to insert data into a table from a csv file.

The function takes a File object and reads the contents.

The data is sanatised (see splitRowIntoFields) and then passed to the supplied query param.

{
  query: "sql_table_insert"
  queryparams: {
      table: "scratch"
  }
  layer: {}
  fields: {
    "numeric_field": "numeric",
    "char_field": "text"
  }
}

 - layer: the layer on which the csv upload is being done.
 - queryparams.table: the table being inserted on.
 - fields: this describes the fields being inserted, the name of the field is used as the key and the type is the value of the key

The function transforms the read data into an object as below:
```json
  {
    "numeric_field::numeric":[
      1,2,3
    ],
    "char_field::text":[
      'a','b','c'
    ]
  }

This data is passed to the relevant insert query (defaults to sql_table_insert).

Additionally files exceeding the lambda upload limit (6mb) will be chunked into parts and inserted separately.