first_samp_timestamp_val property does not work because LibraryInterpreter is missing a method

[bkeryan]

The nidaqmx.Timing.first_samp_timestamp_val property does not work because LibraryInterpreter is missing the get_timing_attribute_timestamp method.

>>> t = nidaqmx.Task()
>>> t.timing.first_samp_timestamp_val
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "D:\dev\nidaqmx-python\generated\nidaqmx\task\_timing.py", line 424, in first_samp_timestamp_val
    val = self._interpreter.get_timing_attribute_timestamp(self._handle, 0x313a)
AttributeError: 'LibraryInterpreter' object has no attribute 'get_timing_attribute_timestamp'

Workaround: use task.wait_for_valid_timestamp(TimestampEvent.FIRST_SAMPLE) to get the timestamp.

[bkeryan]

@zhindes @WayneDroid We should have added a test for this in #592 . Is there any reason we didn't?

Also, I think mypy would have caught this if the constructor arguments in https://github.com/ni/nidaqmx-python/blob/c09f2e286b8486272086d96f6a9846b20fa14520/generated/nidaqmx/task/_timing.py had type hints. We should try adding them, and if that enables mypy to catch errors like this, we should add these type hints to all of the subobject classes.

[WayneDroid]

@zhindes @WayneDroid We should have added a test for this in #592 . Is there any reason we didn't?

Also, I think mypy would have caught this if the constructor arguments in https://github.com/ni/nidaqmx-python/blob/c09f2e286b8486272086d96f6a9846b20fa14520/generated/nidaqmx/task/_timing.py had type hints. We should try adding them, and if that enables mypy to catch errors like this, we should add these type hints to all of the subobject classes.

I can't recall why no test case added for those properties, maybe overlooked.