Add pmap for backend

[nefrathenrici]

Purpose

To-do

Content

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• I have read and checked the items on the review checklist.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 28.19%. Comparing base (c6033ec) to head (66da132).

Files	Patch %	Lines
src/backends.jl	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
- Coverage   28.27%   28.19%   -0.09%     
==========================================
  Files           8        8              
  Lines         343      344       +1     
==========================================
  Hits           97       97              
- Misses        246      247       +1     

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