[SPARK-27189][CORE] Add Executor metrics and memory usage instrumentation to the metrics system#24132

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LucaCanali:memoryMetricsSource

Commits on Nov 11, 2019

Executor Metrics integration with the Spark metrics system re-implemeted after #23767
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Added configuration parameter and tests
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Commits on Nov 25, 2019

Updates following review comments.
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Commits on Nov 29, 2019

Implement naming convention for spark metrics configuration parameters
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Commits on Dec 2, 2019

Added case None
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Commits on Dec 5, 2019

addressed review comment
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