Add array::copy_to_host function

[upsj]

For debugging and development purposes, this makes it easier to get a host view of device data.

[MarcelKoch]

LGTM. A bit confused that we don't have a unified array test, but that is not really relevant to the PR.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.40%. Comparing base (fc67314) to head (2b15202).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1835      +/-   ##
===========================================
+ Coverage    88.73%   89.40%   +0.67%     
===========================================
  Files          831      831              
  Lines        69570    69506      -64     
===========================================
+ Hits         61731    62141     +410     
+ Misses        7839     7365     -474     

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