Change pad value w/ ElementConversion

[laggui]

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

Related Issues/PRs

Following this discord comment

Changes

Changed tensor.pad(...) pad value argument to accept E: ElementConversion (like the other APIs such as Tensor::full(...), which is used by tensor.pad).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.84%. Comparing base (d9418ad) to head (9b75388).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2653   +/-   ##
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  Coverage   81.84%   81.84%           
=======================================
  Files         838      838           
  Lines      107488   107488           
=======================================
  Hits        87975    87975           
  Misses      19513    19513           

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