Gen consumer template accessors

[alesr]

Refactored the code generator so it creates helper methods in the consuming app (instead of inside templator).

Updated the README so examples reflect the current API and generator workflow.
Did this to simplify setup: users no longer need extra wrapping around generated methods.

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.32%. Comparing base (5eac38e) to head (c18cd71).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/generate/generate_methods.go	62.50%	21 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
- Coverage   84.53%   82.32%   -2.21%     
==========================================
  Files           4        4              
  Lines         181      215      +34     
==========================================
+ Hits          153      177      +24     
- Misses         16       25       +9     
- Partials       12       13       +1     

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