[C++][Pistache] Add error handlers overload taking the response object

[sjoubert]

This allows overriders to have full access to the response object and more finely control the error handling behavior.
For example, this enables the specification of a proper Content-Type header in case of custom format responses (application/json, application/problem+json,...)

This should be backward compatible, providing a second overloaded version with full response access to chose from if needed. The new version taking priority if both overloads are overridden.

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[muttleyxd]

Nice idea, looks good to me