Feature/single source exec #56
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fix csv_json example
# Conflicts: # datafusion/physical-plan/src/aggregates/mod.rs
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Which issue does this PR close?
Closes apache#13838.
Rationale for this change
This PR merges all Data sources into one Execution Plan, named DataSourceExec and a single trait named DataSource which is inspired by DataSink.
This version is not intended to be merged in Upstream since it removes all the ParquetExec, CsvExec, etc., and changes all the tests, but I'm sharing this as is so that we can see all possible changes. But our main intention is to re-adding old execution plans as deprecated ones and implement this part by part to keep API stability.
What changes are included in this PR?
Are these changes tested?
Are there any user-facing changes?