ProgramAccount.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 ProgramAccount.fromJson(final Map<String, dynamic> json) =>
    ProgramAccount(
      pubkey: json['pubkey'],
      account: AccountInfo.fromJson(json['account']),
    );