fix(benches): relax `default measurement time`, split `benches` and run `fast...

fix(benches): relax `default measurement time`, split `benches` and run `fast call` only on batches (#885)

* fix(benches): relax default and split benches

* decrease slow and memory call overhead

* revert `memory and slow call` + batch on slow_call

* Update benches/helpers.rs

* add asserts for fast_call