Fixing param type

[Mzack9999]

Close #734

[neo-by-projectdiscovery-dev]

Neo - PR Security Review

No security issues found

Highlights

• Fixes parameter type extraction in memoize code generator by replacing fmt.Sprint() with types.ExprString()
• Adds test coverage to verify context.Context and other qualified types are correctly extracted
• Changes affect build-time code generation, not runtime security boundaries

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