Splitted the JIT stuff from the Wgpu stuff

[nathanielsimard]

The JIT backend still have a dependency on wgsl, since some shaders are written in it and not yet ported to our new compiler, but this isn't a problem for now.

Deleted some matmul kernels that aren't used or not relevant anymore.
All tests in burn-jit now follow the same pattern as with burn-tensor and burn-autodiff; each tests in exported and run on the concrete implementation.

[antimora]

Description is out of date

[codecov]

Codecov Report

Attention: Patch coverage is 93.34812% with 150 lines in your changes are missing coverage. Please review.

Project coverage is 85.67%. Comparing base (0c92c8c) to head (48b0632).
Report is 1 commits behind head on main.

Files	Patch %	Lines
crates/burn-wgpu/src/runtime.rs	57.64%	72 Missing ⚠️
crates/burn-jit/src/kernel/prng/uniform.rs	54.73%	43 Missing ⚠️
crates/burn-jit/src/tests/matmul.rs	96.89%	16 Missing ⚠️
crates/burn-jit/src/fusion/base.rs	0.00%	4 Missing ⚠️
crates/burn-wgpu/src/fusion.rs	50.00%	4 Missing ⚠️
crates/burn-jit/src/compute/kernel.rs	92.85%	3 Missing ⚠️
.../burn-jit/src/codegen/dialect/gpu/vectorization.rs	75.00%	2 Missing ⚠️
crates/burn-jit/src/kernel/interpolate.rs	0.00%	2 Missing ⚠️
crates/burn-jit/src/kernel/mask/mask_fill.rs	98.46%	1 Missing ⚠️
crates/burn-jit/src/kernel/mask/mask_where.rs	98.57%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1417      +/-   ##
==========================================
- Coverage   85.83%   85.67%   -0.16%     
==========================================
  Files         613      637      +24     
  Lines       71148    70286     -862     
==========================================
- Hits        61068    60219     -849     
+ Misses      10080    10067      -13     

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