Support projection pushdown after beginning of pipeline.
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core
java
new feature
P2
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Description
The first iteration of projection pushdown will only support pushdown on transforms at the beginning of the pipeline.
This is due to difficulties using PTransformOverrideFactory - it requires getting the transform's input as an argument, and there's currently no way to do this generically.
For more on projection pushdown, see BEAM-12976.
Imported from Jira [BEAM-13658](https://issues.apache.org/jira/browse/BEAM-13658). Original Jira may contain additional context.
Reported by: ibzib.
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