SAMPLED_BYTE_SIZE counter should consider recording size per winodw
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harness
improvement
java
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Description
Currently, SAMPLED_BYTE_SIZE records size per WindowedValue. We should consider recording size per window when we have window optimization(one WindowedValue has multiple windows if possible to reduce metadata and processing overhead).
Imported from Jira [BEAM-11879](https://issues.apache.org/jira/browse/BEAM-11879). Original Jira may contain additional context.
Reported by: boyuanz.
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