AccountInfo<T>.fromJson  constructor 
Creates an instance of this class from the constructor parameters defined in the json
object.
Example
class Item extends Serializable {
  const(this.name, this.count);
  final String name;
  final int? count;
}
final Item x = Item.fromJson({
  'name': 'apple',
  'count': 10,
});
Implementation
factory AccountInfo.fromJson(final Map<String, dynamic> json) => AccountInfo(
  lamports: json['lamports'],
  owner: json['owner'],
  data: DataSerializableMixin.decode(json['data']),
  executable: json['executable'],
  rentEpoch: json['rentEpoch'],
);