Set start time of extractors.

[toondaey]

This simply does nothing right now but just set the start time of the extractor. This will be used for one, when we report the startup.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.87%. Comparing base (184f8fe) to head (423fa03).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
cognite/extractorutils/unstable/core/base.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #458      +/-   ##
==========================================
- Coverage   78.88%   78.87%   -0.02%     
==========================================
  Files          42       42              
  Lines        3647     3650       +3     
==========================================
+ Hits         2877     2879       +2     
- Misses        770      771       +1     

Files with missing lines	Coverage Δ
cognite/extractorutils/unstable/core/base.py	76.92% <66.66%> (-0.18%)	⬇️

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[Hmnt39]

Looks good

[thorkildcognite]

nice to set it to UTC! Have had a ton of problems correlating when the customer has some funky timezones in use when running on their systems. Very confusing.

[thorkildcognite]

risk review ok -- it will be good to report this in the future, indeed. Today, it is quite hard to detect extractors that end up in crash-looping (we've had that with the petrel studio connector for example -- although that is a very different type of beast that isn't in Python it taught me the need for this).

[toondaey]

risk review ok -- it will be good to report this in the future, indeed. Today, it is quite hard to detect extractors that end up in crash-looping (we've had that with the petrel studio connector for example -- although that is a very different type of beast that isn't in Python it taught me the need for this).

This was discovered as a drawback of the previous extractors. There's a follow up PR coming soon to include this when the extractor reports a startup.