3581952 add free-form metadata bag on InputInterface; seed pre/post/streaming...

Alphons Jaimonrequested to merge
issue/ai-3581952:3581952-add-event-hook-1.4.x into 1.5.x

3581952 add free-form metadata bag on InputInterface; seed pre/post/streaming events from input metadata in ProviderProxy

Closes #3581952

Issue: #3581952

Edited by Rob Loach

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