Rollback modbus to version 0.107.7 keep new functionality (#34287)

* Rollback modbus to version 0.107.7

Update manifest to not use async.

Rollback entities to sync version.

Keep newer modifications apart from async.

Rollback __init__ to sync version but keep the new functionality.

add async sub directory

Adding the current (not working) version in a sub directory,
to allow easy sharing with a few alfa testers.

The async version are to be updated to use the serial/tcp already
available instead of the flaky pymodbus version. pymodbus is still
needed to encode/decode the messagess.

Update test cases to reflect sync implementation, but
keep the new functionality like e.g. conftest.py.

* do not publish async version

The async version will be made available in a forked repo, until
it is ready to replace the production code.

tests/components/modbus/conftest.py

@@ -40,19 +40,11 @@ class ReadResult:
         self.registers = register_words
 
 
-read_result = None
-
-
 async def run_test(
     hass, use_mock_hub, register_config, entity_domain, register_words, expected
 ):
     """Run test for given config and check that sensor outputs expected result."""
 
-    async def simulate_read_registers(unit, address, count):
-        """Simulate modbus register read."""
-        del unit, address, count  # not used in simulation, but in real connection
-        return read_result
-
     # Full sensor configuration
     sensor_name = "modbus_test_sensor"
     scan_interval = 5
@@ -69,9 +61,9 @@ async def run_test(
     # Setup inputs for the sensor
     read_result = ReadResult(register_words)
     if register_config.get(CONF_REGISTER_TYPE) == CALL_TYPE_REGISTER_INPUT:
-        use_mock_hub.read_input_registers = simulate_read_registers
+        use_mock_hub.read_input_registers.return_value = read_result
     else:
-        use_mock_hub.read_holding_registers = simulate_read_registers
+        use_mock_hub.read_holding_registers.return_value = read_result
 
     # Initialize sensor
     now = dt_util.utcnow()