exp: intake contract for ResultHandler

[RobinTail]

Exploring the DX trade-off between the requirement for ResultHandler to handle any object-based output coming from Endpoints, or giving an ability to enforce type-only contract between ResultHandler and Endpoint through EndpointsFactory.

The POC looks promising except the EndpointsFactory::buildVoid() method that stands out of the concept.

The risk of possible temptation to abuse the type-only contract and remove runtime checks completely may compromise the stability of final products. Therefore, it's still under consideration.

[coderabbitai]

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[coveralls-official]

coverage: 100.0%. remained the same — rh-intake-contract into master