feat: Make field.UUID Compatible With enthistory.WithInheritIdType

[frisbm]

Description

Closes #80

Added support for anonymous function defaults in field.UUID when using WithInheritIdType(). The fix extracts the anonymous function source code from the original schema file using runtime information and includes it in the generated history schema.

Motivation and Context

Fixes the issue where using field.UUID with an anonymous function Default (e.g., Default(func() uuid.UUID { return uuid.Must(uuid.NewV7()) })) caused code generation to fail with:

schemast: only selector exprs are supported for default func

How Has This Been Tested?

• Added unit tests in generate_test.go covering anonymous function defaults for both direct fields and mixin-based fields
• Added a new User schema in _examples/graphql that uses the exact reproduction case
• Verified generated user_history.go properly inherits the anonymous function
• All existing tests pass

Screenshots (if appropriate):

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update or addition to documentation for this project)

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[flume-bot]

✅ Snyk checks have passed. No issues have been found so far.

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[frisbm]

@lillialjackson @josue @corvramirez

[josue]

LGTM