Fixed a bug that introduced enourmous delays when using checkpointing

[DanteNiewenhuis]

Summary

Fixed a bug in the creation of checkpoint snapshots that caused snapshots to become much larger than intended in specific scenarios.

Also updated the way fragments are handled to allow fragments with a duration of 0.

Added three new metrics for Tasks that measure the delay of a task caused by scheduling, failure, and checkpointing.

Implementation Notes ⚒️

Making snapshots in SimTraceWorkload now uses the same functions as OnUpdate to update the remaining work and time in the fragment.

External Dependencies 🍀

N / A

Breaking API Changes ⚠️

N / A

Simply specify none (N/A) if not applicable.

[codecov]

Codecov Report

❌ Patch coverage is 87.75510% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.44%. Comparing base (71f6361) to head (58b48c9).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...lator/compute/workload/trace/SimTraceWorkload.java	84.90%	3 Missing and 5 partials ⚠️
...mulator/telemetry/parquet/DfltTaskExportColumns.kt	75.00%	3 Missing ⚠️
.../opendc/compute/simulator/service/ServiceTask.java	83.33%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #380      +/-   ##
============================================
+ Coverage     57.36%   57.44%   +0.08%     
  Complexity        1        1              
============================================
  Files           335      335              
  Lines         10788    10826      +38     
  Branches       1037     1038       +1     
============================================
+ Hits           6188     6219      +31     
- Misses         4235     4240       +5     
- Partials        365      367       +2     

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