Add set module

pkg/container/batch/batch.go

pkg/hash/setgroup.go

pkg/hash/types.go

pkg/sql/colexec/hashgroup/group.go

pkg/sql/colexec/hashjoin/join.go

pkg/sql/colexec/hashjoin/types.go

pkg/sql/colexec/limit/limit.go

pkg/sql/colexec/mergesum/summarize.go

pkg/sql/colexec/offset/offset.go

pkg/sql/colexec/output/output.go

pkg/sql/colexec/projection/projection.go

pkg/sql/colexec/restrict/restrict.go

pkg/sql/colexec/summarize/summarize.go

pkg/sql/colexec/top/top.go

pkg/sql/colexec/transfer/transfer.go

pkg/sql/colexec/transfer/types.go

pkg/sql/colexec/unittest/extendProjection_test.go

pkg/sql/colexec/unittest/intersect_test.go

pkg/sql/colexec/unittest/limit_test.go

pkg/sql/colexec/unittest/offset_test.go