historyRead with ExtensionObject

47b5982 fix(client): ensure historyRead delegates to promoteOpaqueStructure

- Promote OpaqueStructure to ExtensionObject in historyRead results for
  HistoryData with dataValues.
- Use promoteOpaqueStructure to resolve DataType similar to the read method.
- Add regression test test_e2e_history_read_extension_object.ts.
- Include playground example server_with_historizing_extension_object.ts.