rusk: map dispatch parse errors to 404/422

[Neotamandua]

No description provided.

[Copilot]

Pull request overview

This PR introduces a dedicated request parsing error type for RUES dispatch and maps specific parsing failures to more appropriate HTTP status codes (404/422), with added test coverage.

Changes:

• Added RequestParseError and updated RuesDispatchEvent::from_request to return it.
• Updated request handling to translate parse errors into 404 (invalid path) / 422 (invalid payload) responses.
• Added tests asserting the new status code behavior and generalized a status/body assertion helper.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
rusk/src/lib/http/event.rs	Introduces RequestParseError and replaces panicking/opaque parsing failures with typed parse errors.
rusk/src/lib/http.rs	Maps RequestParseError to 404/422/500 responses and adds tests for invalid path and invalid UTF-8 payload handling.

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