[backend-comparison] Fix automatic fusion activation with wgpu

[syl20bnr]

Checklist

• Confirmed that run-checks all script has been executed.
• Made sure the book is up to date with changes in this PR.

Changes

With the addition of the dependency on burn-wgpu to retrieve system information we had a regression where fusion was always enabled for the wgpu benchmark feature.

This PR disables the default feature for burn-wgpu and add the required default dependencies t be able to retrieve the system information.

Testing

cargo run --release --bin burnbench -- run --benches unary --backends wgpu

cargo run --release --bin burnbench -- run --benches unary --backends wgpu-fusion

cargo run --release --bin burnbench -- run --benches unary --backends candle-cpu

cargo build -p backend-comparison

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.35%. Comparing base (9f9b52c) to head (6d6b32a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1542      +/-   ##
==========================================
- Coverage   86.36%   86.35%   -0.01%     
==========================================
  Files         682      682              
  Lines       77849    77849              
==========================================
- Hits        67231    67230       -1     
- Misses      10618    10619       +1     

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[antimora]

LGTM