Replace usage of datetime library types with hightime types

[sbethur]

• This contribution adheres to CONTRIBUTING.md.

• I've updated CHANGELOG.md if applicable.

• I've added tests applicable for this pull request

What does this Pull Request accomplish?

In all nimi-python modules, change the type of applicable properties and method parameters from datetime.timedelta to hightime.timedelta and from datetime.datetime to hightime.datetime.

hightime types are drop-in replacements for datetime counterparts, with sub-microsecond resolution. See #1445 (comment) for the rationale behind this change.

• Update code generator to generate code using hightime types
• Update applicable attribute and function metadata to use hightime types
• Update nifake unit tests to verify usage of hightime types

List issues fixed by this Pull Request below, if any.

• Fix datetime.timedelta not precise enough for all nimi-python use cases #744
• Fix datetime.timedelta does not provide the necessary resolution for many methods and properties in nidigital #1368
• Fix nitclk.SessionReference.sample_clock_delay loses precision when read #1382
• Fix Return type of get_time_set_edge() and get_time_set_period() should be change hightime.TimeDelta #1397

What testing has been done?

Update unit tests for converter and nifake to verify usage of hightime types. CI runs all the tests.

[codecov]

Codecov Report

Merging #1449 into master will increase coverage by 1.44%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master    #1449      +/-   ##
==========================================
+ Coverage   91.92%   93.37%   +1.44%     
==========================================
  Files          20       25       +5     
  Lines        3655     5177    +1522     
==========================================
+ Hits         3360     4834    +1474     
- Misses        295      343      +48     

Flag	Coverage Δ
#codegenunittests	88.24% <ø> (ø)
#nidigitalsystemtests	96.91% <ø> (?)
#nifakeunittests	96.40% <100.00%> (+<0.01%)	⬆️
#nifgensystemtests	96.91% <0.00%> (?)
#nimodinstsystemtests	87.23% <ø> (?)
#nimodinstunittests	95.37% <ø> (ø)
#nisesystemtests	100.00% <ø> (?)
#nitclkunittests	95.45% <100.00%> (ø)

Impacted Files	Coverage Δ
build/helper/codegen_helper.py	92.44% <ø> (ø)
build/helper/metadata_add_all.py	81.35% <ø> (ø)
generated/nifgen/nifgen/_library.py	96.91% <0.00%> (ø)
generated/nifake/nifake/_attributes.py	94.73% <100.00%> (ø)
generated/nifake/nifake/_converters.py	96.70% <100.00%> (+0.02%)	⬆️
generated/nifake/nifake/session.py	97.69% <100.00%> (ø)
generated/nitclk/nitclk/session.py	95.45% <100.00%> (ø)
generated/nimodinst/nimodinst/_library.py	87.23% <0.00%> (ø)
...digital/nidigital/history_ram_cycle_information.py	100.00% <0.00%> (ø)
... and 2 more

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