feat: Added the ensure_type() function

[dusktreader]

Also updated some documentation.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.97%. Comparing base (cff1f04) to head (2d08ad9).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/buzz/tools.py	91.66%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
+ Coverage   91.81%   91.97%   +0.16%     
==========================================
  Files           3        3              
  Lines         171      187      +16     
==========================================
+ Hits          157      172      +15     
- Misses         14       15       +1     

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