feat(gen): add OperationName type (an alias for string type)

[saccho]

Overview

Introducing the OperationName type (a string type alias for backward compatibility) and automatically generating all OperationName constants enhances the usability and safety for users using security features.

Users typically do not need to be aware of Ogen's OperationName. By changing the type from string to OperationName and allowing users to utilize the auto-generated OperationName, applications can be built more easily and safely.

Why?

When using SecurityHandler, the strings assigned to operationName were unclear. I believed that having auto-generated OperationName constants would improve clarity and allow compiler checks for enhanced safety, so I added them.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.44%. Comparing base (dbd90b0) to head (20a20b7).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1337   +/-   ##
=======================================
  Coverage   71.44%   71.44%           
=======================================
  Files         190      190           
  Lines       15587    15588    +1     
=======================================
+ Hits        11136    11137    +1     
  Misses       3898     3898           
  Partials      553      553           

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[tdakkota]

LGTM, thanks.