apache / apache/beam

Handle map encoding better.

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go improvement P3
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Description

Maps are a dangerous type to have as part of key values, and the Go SDK currently doesn't handle them very well. Until we have a default coder that assures that map encodings are canonical, it's better that we restrict their usage within the SDK.

Imported from Jira [BEAM-6652](https://issues.apache.org/jira/browse/BEAM-6652). Original Jira may contain additional context.
Reported by: lostluck.

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