apache / apache/beam

Consider allocating AssignContext only once in the Java SDK Harness

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harness java new feature P3
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Description

Instead of allocating the assign context for every call, create the context once and update a pointer to the current `WindowedValue` whenever we receive a call.

Imported from Jira [BEAM-4272](https://issues.apache.org/jira/browse/BEAM-4272). Original Jira may contain additional context.
Reported by: tgroh.

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