Use HiresClock ticks instead of DateTime for IntervalRunner publish time calculation

[mrsuciu]

Use HiresClock instead of DateTime for IntervalRunner publish time calculation

Proposed changes

PubSub IntervalRunner used System clock dependent DateTime values for calculating the publish time, which may produce wrong time values and all consequences that derive from this.
This PR replaces DateTime values in the time calculation with HiresClock (Stopwatch) monotonic values.

Related Issues

• Fixes PubSub - WriterGroup publishing time is drifting #2740

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• Bugfix (non-breaking change which fixes an issue)
• Enhancement (non-breaking change which adds functionality)
• Test enhancement (non-breaking change to increase test coverage)
• Breaking change (fix or feature that would cause existing functionality to not work as expected, requires version increase of Nuget packages)
• Documentation Update (if none of the other choices apply)

Checklist

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• I ran tests locally with my changes, all passed.
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• Any dependent changes have been merged and published in downstream modules.

Further comments

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.

Project coverage is 54.62%. Comparing base (6dcee7e) to head (dcdfdf3).
Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
Libraries/Opc.Ua.PubSub/IntervalRunner.cs	0.00%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2753      +/-   ##
==========================================
- Coverage   55.12%   54.62%   -0.51%     
==========================================
  Files         349      349              
  Lines       65548    65702     +154     
  Branches    13398    13445      +47     
==========================================
- Hits        36135    35888     -247     
- Misses      25584    25921     +337     
- Partials     3829     3893      +64     

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[mregen]

same as above