Add python<-->gRPC converters for AnalogWaveform and DateTime.

[mjohanse-emr]

What does this Pull Request accomplish?

Creates python<-->gRPC converters for waveform.AnalogWaveform and bintime.DateTime.

Two converters created:
AnalogWaveform (python) <--> DoubleAnalogWaveform (protobuf)

• Only handles AnalogWaveforms with type np.float64
• Only sets timing parameters if available (t0, dt)
• Converts ExtendedPropertyDictionary to the associated protobuf field attributes

DateTime (python) <--> PrecisionTimestamp (protobuf)

• Converts between ticks and (whole seconds, fractional seconds)
• Will eventually use to_tuple and from_tuple() entrypoints from nitypes

Why should this Pull Request be merged?

Contributes to development for AB#3161134

What testing has been done?

I added unit tests for the AnalogWaveform converter (both directions). All unit tests pass.

[github-actions]

Test Results

 10 files  ±  0   10 suites  ±0   15s ⏱️ -6s
 96 tests + 16   96 ✅ + 16  0 💤 ±0  0 ❌ ±0 
930 runs  +160  930 ✅ +160  0 💤 ±0  0 ❌ ±0 

Results for commit bda3e42. ± Comparison against base commit 9afcc8a.

This pull request removes 2 and adds 18 tests. Note that renamed tests count towards both.

tests.unit.test_streamlit_panel ‑ test___get_value_returns_default_when_value_not_set
tests.unit.test_streamlit_panel ‑ test___set_value___get_value_ignores_default

tests.unit.test_protobuf_type_conversion ‑ test___analog_waveform_non_zero_samples___convert___valid_protobuf
tests.unit.test_protobuf_type_conversion ‑ test___analog_waveform_samples_only___convert___valid_protobuf
tests.unit.test_protobuf_type_conversion ‑ test___analog_waveform_with_extended_properties___convert___valid_protobuf
tests.unit.test_protobuf_type_conversion ‑ test___analog_waveform_with_standard_timing___convert___valid_protobuf
tests.unit.test_protobuf_type_conversion ‑ test___dbl_analog_wfm_with_attributes___convert___valid_python_object
tests.unit.test_protobuf_type_conversion ‑ test___dbl_analog_wfm_with_timing___convert___valid_python_object
tests.unit.test_protobuf_type_conversion ‑ test___dbl_analog_wfm_with_timing_no_dt___convert___valid_python_object
tests.unit.test_protobuf_type_conversion ‑ test___dbl_analog_wfm_with_timing_no_t0___convert___valid_python_object
tests.unit.test_protobuf_type_conversion ‑ test___dbl_analog_wfm_with_y_data___convert___valid_python_object
tests.unit.test_protobuf_type_conversion ‑ test___default_analog_waveform___convert___valid_protobuf
…

♻️ This comment has been updated with latest results.

[mjohanse-emr]

Just some explanatory comments to inform reviewers.

[mjohanse-emr]

Implementation details I'm not sure about that I am looking to get feedback on.

[bkeryan]

This PR was in draft mode when I checked for PRs to review earlier, so I will review it tomorrow.