memory: Drop support for managed memory

[stotko]

Managed memory has always been a niche feature in the memory module and required more complex initialization code including additional workarounds to ensure correct behavior on older GPUs. Other frameworks like PyTorch also do not support it for similar reasons. Thus, drop the support for managed memory. This will facilitate future improvements such as more complete stream/execution policy support.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.53%. Comparing base (9005240) to head (535dae5).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #445      +/-   ##
==========================================
- Coverage   97.61%   97.53%   -0.09%     
==========================================
  Files          32       32              
  Lines        2602     2556      -46     
==========================================
- Hits         2540     2493      -47     
- Misses         62       63       +1     

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