Batch processor refactoring, testing #5026

Job	Run time
structure_check (otap-dataflow)	31s
docs (otap-dataflow)	1m 40s
docs (experimental/query_engine)	1m 16s
document-build-options	3s
docs (experimental/query_abstraction)	23s
test_and_coverage (otap-dataflow)	5m 50s
test_and_coverage (experimental/query_abstraction)	1m 32s
fmt (experimental/query_engine)	25s
fmt (experimental/query_abstraction)	27s
test_and_coverage (experimental/query_engine)	4m 0s
fmt (otap-dataflow)	20s
deny (otap-dataflow)	2m 10s
deny (experimental/query_abstraction)	33s
clippy (experimental/query_abstraction)	26s
clippy (experimental/query_engine)	1m 18s
clippy (otap-dataflow)	2m 5s
deny (experimental/query_engine)	51s
	23m 50s

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