Add a pmap like function

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 86.90476% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 91.60%. Comparing base (fdaefc5) to head (6dfe77d).

Files	Patch %	Lines
src/controller.jl	73.91%	6 Missing :warning:
src/worker.jl	69.23%	4 Missing :warning:
src/pmap.jl	97.82%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5 +/- ## ========================================== + Coverage 90.66% 91.60% +0.94% ========================================== Files 5 6 +1 Lines 75 143 +68 ========================================== + Hits 68 131 +63 - Misses 7 12 +5 ```

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