Update waveform conversion code to account for new timing fields

[mjohanse-emr]

What does this Pull Request accomplish?

AB#3877566

Updates the waveform conversion functions to handle the following new timing fields:

• timestamp
• time_offset
• timestamps

NI-APIs change to add the new fields

Unit tests have been added to test conversion cases specific to these parameters.
Existing unit tests have been updated where necessary (example, don't expect and exception for irregular timing anymore). Unit test updates include

• Adding new unit tests for the new timing parameters. Ideas for new tests were taken from the similar C# change.
• Refactoring timing based unit tests into a separate base class.
• Moving the rest of the waveform validation tests into subclasses based on the waveform type
• Separating the spectrum tests into a different file since they are not timing based and don't need to be a subclass.

Similar change in the C# API

Why should this Pull Request be merged?

To establish parity between our python API and our C# API.
To allow Python users to publish Irregular Timing waveforms and "Relative Timing" waveforms.

What testing has been done?

Many new tests have been added that were inspired by the C# auto tests.
Existing waveform conversion tests are passing.

[github-actions]

Test Results

  120 files  ±    0    120 suites  ±0   3m 18s ⏱️ -4s
  366 tests +  115    358 ✅ +  109    8 💤 + 6  0 ❌ ±0 
3 660 runs  +1 150  3 546 ✅ +1 066  114 💤 +84  0 ❌ ±0 

Results for commit da641d0. ± Comparison against base commit 0b84363.

This pull request removes 71 and adds 186 tests. Note that renamed tests count towards both.

tests.unit.test_waveform_conversion ‑ test___analog_waveform_non_zero_samples___convert___valid_protobuf
tests.unit.test_waveform_conversion ‑ test___analog_waveform_samples_only___convert___valid_protobuf
tests.unit.test_waveform_conversion ‑ test___analog_waveform_with_extended_properties___convert___valid_protobuf
tests.unit.test_waveform_conversion ‑ test___analog_waveform_with_irregular_timing___convert___raises_value_error
tests.unit.test_waveform_conversion ‑ test___analog_waveform_with_standard_timing___convert___valid_protobuf
tests.unit.test_waveform_conversion ‑ test___dbl_analog_wfm_with_attributes___convert___valid_python_object
tests.unit.test_waveform_conversion ‑ test___dbl_analog_wfm_with_timing___convert___valid_python_object
tests.unit.test_waveform_conversion ‑ test___dbl_analog_wfm_with_timing_no_dt___convert___valid_python_object
tests.unit.test_waveform_conversion ‑ test___dbl_analog_wfm_with_timing_no_t0___convert___valid_python_object
tests.unit.test_waveform_conversion ‑ test___dbl_analog_wfm_with_y_data___convert___valid_python_object
…

tests.unit.test_spectrum_conversion ‑ test___dbl_spectrum_with_attributes___convert___valid_python_object
tests.unit.test_spectrum_conversion ‑ test___dbl_spectrum_with_data___convert___valid_python_object
tests.unit.test_spectrum_conversion ‑ test___default_dbl_spectrum___convert___valid_python_object
tests.unit.test_spectrum_conversion ‑ test___default_spectrum___convert___valid_protobuf
tests.unit.test_spectrum_conversion ‑ test___spectrum_with_data___convert___valid_protobuf
tests.unit.test_spectrum_conversion ‑ test___spectrum_with_extended_properties___convert___valid_protobuf
tests.unit.test_waveform_conversion.TestDigitalWaveformConversion ‑ test____waveform_with_scaling___convert___valid_protobuf
tests.unit.test_waveform_conversion.TestDigitalWaveformConversion ‑ test___default_digital_waveform___convert___valid_protobuf
tests.unit.test_waveform_conversion.TestDigitalWaveformConversion ‑ test___default_digital_waveform_proto___convert___valid_python_object
tests.unit.test_waveform_conversion.TestDigitalWaveformConversion ‑ test___digital_waveform_proto_with_attributes___convert___valid_python_object
…

♻️ This comment has been updated with latest results.

[jasonmreding]

I only did a cursory review of the test changes as I assume it was mostly refactoring. If you want a more thorough review of anything in particular, let me know.