Added oneAPI extension and buildkite CI

[anicusan]

This is almost verbatim from the extensions refactor.
With this, we should now have atomics on all AcceleratedKernels.jl backends, yay!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 31 lines in your changes missing coverage. Please review.

Project coverage is 60.16%. Comparing base (e60c518) to head (873e7b6).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
ext/AtomixoneAPIExt.jl	0.00%	31 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #43       +/-   ##
===========================================
- Coverage   92.95%   60.16%   -32.79%     
===========================================
  Files           6        9        +3     
  Lines         142      236       +94     
===========================================
+ Hits          132      142       +10     
- Misses         10       94       +84     

Flag	Coverage Δ
Pkg.test	60.16% <0.00%> (-32.79%)	⬇️

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[anicusan]

Okay, all backend extensions are found and their tests work when temporarily setting Atomix version=0.1.0 so that all packages can be downloaded (otherwise dependency conflicts appear).

@maleadt I updated to version=1.0.0 like you did the first time in the initial pull request.

Any other feedback is very welcome.