[BEAM-4726] Add a simple benchmark to the ParDo execution node. #5881
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Adding a benchmark to get a baseline on ParDo overhead.
Adds a new root construct to accommodate perfered Go Benchmarking style, and allow the testing package to handle benchmark termination appropriately.
$ go test -bench=BenchmarkParDo -benchmem github.com/apache/beam/sdks/go/pkg/beam/core/runtime/exec
On my desktop, this benchmark currently returns in the neighbourhood of
BenchmarkParDo_EmitSumFn-12 1000000 1606 ns/op 585 B/op 7 allocs/op
Post-Commit Tests Status (on master branch)