[BEAM-12634] JmsIO auto scaling feature

[rvballada]

Add autoscaling feature to JmsIO connector:

• Provide a generic AutoScaler interface with the ability to implement getTotalbacklogBytes or/and getSplitBacklogBytes,

• Provide a DefaultAutoScaler implementation (returning BACKLOG_UNKNOWN in both case),

• add a new withAutoScaler configuration method to inject a custom auto scaler

• https://issues.apache.org/jira/browse/BEAM-12634

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[rvballada]

R: @lukecwik

[rvballada]

retest this please

[lukecwik]

I was wrong in suggesting adding the getSplitBacklogBytes because we would need to expose a way for the autoscaler to know the current split which I believe will add a bunch of complexity to the current implementation that we don't want. So let's drop for now and then if it becomes needed it can be re-added.

Other then that just changes to comments.

[pabloem]

what's the status of ths PR? : )

[rvballada]

what's the status of ths PR? : )

Hello, the PR has been reviewed by @lukecwik and changes made accordingly :-)

[lukecwik]

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