Add bool() op for numerical tensor

[antimora]

Fixes #1395

Pull Request Template

Checklist

• 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

Fixes #1395

Changes

1. Add bool() op for numerical tensor
2. Add new unit tests
3. Update the book

Testing

Add new unit tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.73%. Comparing base (046d975) to head (696913a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1402   +/-   ##
=======================================
  Coverage   85.72%   85.73%           
=======================================
  Files         608      609    +1     
  Lines       69745    69761   +16     
=======================================
+ Hits        59792    59808   +16     
  Misses       9953     9953           

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[louisfd]

LGTM