findById method
Busca por id.
Implementation
@override
Future<Map<String, Object?>?> findById(String table, Object id) async {
final r = await _client.get(_u('$table/$id'), headers: _headers);
if (r.statusCode >= 400) return null;
final data = _decode(r)['data'];
return data is Map ? data.cast<String, Object?>() : null;
}