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author polarcoke2 <43122460+polarcoke2@users.noreply.github.com> 1593763183 +0900
committer GitHub <noreply@github.com> 1593763183 +0900
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[NEMO-434] Logical DAG modification for Dynamic sampling of task metrics during the execution of a stage (#292)

JIRA: [NEMO-434: Logical DAG modification for Dynamic sampling of task metrics during the execution of a stage](https://issues.apache.org/jira/projects/NEMO/issues/NEMO-434)

**Major changes:**
- Added new mechanism for launching runtime pass
   - For runtime passes which need to gather information by itself, use MessageGeneratorVertex and MessageAggregatorVertex
   - For runtime passes which need Metric information, use SignalVertex
- Added SignalVertex and SignalTransform to launch runtime pass without collecting any runtime information
- New Compile time pass for DTS which changes DAG
- New TaskSizeSplitterVertex to distinguish and manage sampled data and the rest in vertex level(extended from LoopVertex)
- Added inserting / deleting TaskSizeSplitterVertex and SignalVertex method in IRDAG

**Minor changes to note:**
- Changed the name of TriggerVertex to MessageGeneratorVertex. Since the combination of TriggerVertex and MAV triggers runtime pass, not trigger vertex alone, the name 'Trigger' can be misleading.
- erased duplicate assignments in EmptyComponents class
- new methods in LoopVertex

**Tests for the changes:**
- IRDAGTest and SkewCompositePassTest has been modified by the class name refactoring
- Added new test methods in IRDAGTest regarding TaskSizeSplitterVertex and SignalVertex

**Other comments:**

Closes #292