Add GPU support for to_boundary function

[amontoison]

@AntoninKns

[codecov]

Codecov Report

Base: 98.14% // Head: 98.14% // No change to project coverage 👍

Coverage data is based on head (1eea596) compared to base (ce6704f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #644   +/-   ##
=======================================
  Coverage   98.14%   98.14%           
=======================================
  Files          37       37           
  Lines        6585     6585           
=======================================
  Hits         6463     6463           
  Misses        122      122           

Impacted Files	Coverage Δ
src/krylov_utils.jl	92.57% <100.00%> (ø)

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