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GH-45591: [C++][Acero] Refine hash join benchmark and remove openmp from the project (#45593)



### Rationale for this change

See #45591 .

### What changes are included in this PR?

1. Replace the usage of openmp with arrow-native multi-threading primitives;
2. Remove all the occurrences of openmp from the project;
3. Support stats for build side rows in hash join benchmark, and update certain benchmark.

### Are these changes tested?

Manually tested.

### Are there any user-facing changes?

Removed a public CMake option but I think it shouldn't affect the user.

* GitHub Issue: #45591

Authored-by: Rossi Sun <zanmato1984@gmail.com>
Signed-off-by: Rossi Sun <zanmato1984@gmail.com>