[aggregator] Clean up aggregated metric writer and encoder #4112
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What this PR does / why we need it:
AggregatedDecoder was already de-interfaced, and encoding time/metrics aren't useful (or for encoding time, not even enabled by default).
Special notes for your reviewer:
Does this PR introduce a user-facing and/or backwards incompatible change?:
Does this PR require updating code package or user-facing documentation?: