cleanup (dragoon/komodo!70)

## changelog
* eb1b1381 don't use a T in the lib `run_template` test
* fbd503c6 remove the useless unwrap and TODO
* b550d712 remove some pub
* 339c3038 remove useless `.iter()`
* 537993f0 remove useless `.add(...)`
* d7720907 remove hiding_bound from timer in commit
* eecab5a6 move `commit` to inlined `zk::batch_commit`