test: add tests for forwarded messages and dice functionality

- Add tests for TestClient forwarded message methods (from user, hidden user, chat, channel);
- Add tests for TestUser forwarded message methods with all origin types;
- Add tests for MessageFactory forwarded message creators with all explicit parameters;
- Add tests for MessageFactory.create_dice with explicit parameters;
- Add tests for sendDice with basketball, football, and slot machine emojis verifying correct value ranges.