Support Postgresql arbitrary-dimensional array

Current behavior

Debezium Postgresql connector does not support arbitrary-dimensional array. For example,

In case of two-dimensional array of INT
Postgresql connector warns it and the result value is null.
Avro schema

{
  "name":"c_arr_int",
  "type":[
    "null",
    {
      "type":"array",
      "items":[
        "null",
        "int"
      ],
      "connect.parameters":{
        "__debezium.source.column.type":"_INT4",
        "__debezium.source.column.length":"10"
      }
    }
  ],
  "default":null
}

the warning message

[stgresValueConverter] Unexpected value for JDBC type 4 and column c_arr_int-element int4(10, 0) DEFAULT VALUE NULL: class=Integer[]

In case of two-dimensional array of TEXT
Postgresql connector does not warn as follow and the result value seems to be casted string.
Avro schema

{
  "name":"c_arr_text",
  "type":[
    "null",
    {
      "type":"array",
      "items":[
        "null",
        "string"
      ],
      "connect.parameters":{
        "__debezium.source.column.type":"_TEXT",
        "__debezium.source.column.length":"2147483647"
      }
    }
  ],
  "default":null
}

result value

['[Ljava.lang.String;@3ce73358']

Request

1. Warning should be logged.
   At least, as long as Debezium does not support arbitrary-dimensional array, warning should be logged when it finds a two or more dimensional array of any data type. Moreover, if "include.unknown.datatypes" is enabled, raw binary representation of a column should be set as the result.
2. Support arbitrary-dimensional array
   I guess the reason why Debezium does not support it is that both avro and protobuf can not define an arbitrary-dimensional array schema.
   My suggestion is to define such array schema as a linear(flatten) array with the dimension infomation.