Tech debt: Consolidate parameter class constructors

[leandrodamascena]

Why is this needed?

Path, Query, Header, Cookie all inherit from Param but each one copies the entire __init__ with 25+ parameters. The __init__ can live only in Param. Subclasses just set in_ and override specific behavior (e.g. Header has convert_underscores).

Same story for Body/Form/File.

Steps:

1. Move the full __init__ to Param base class
2. Subclasses override only what differs (default value, alias behavior)
3. Keep class names and import paths identical
4. Verify Pydantic FieldInfo compatibility

Which area does this relate to?

Event Handler - REST API

Suggestion

No response

Acknowledgment

• This request meets Powertools for AWS Lambda (Python) Tenets
• Should this be considered in other Powertools for AWS Lambda languages? i.e. Java, TypeScript, and .NET

[powertools-for-aws-oss-automation]

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[github-actions]

This is now released under 3.28.0 version!