[SAMZA-2775] Fix potential memory leaks - ASF JIRA

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When using Samza standalone, we found out a few possible memory leakage in the following classes:

MetricsHelper.newGauge(): we are creating an anonymous class object inside this function which holds reference to outer class object, typically TaskInstance.
BlockingEnvelopeMap class has a few inner Metrics classes which are not marked as static.

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Fix potential memory leaks