Fix discussions from fault tolerance mechanism MR

Context

Fix (parts of) discussions from #276.

• change int type for std::uint8_t and std::size_t
• reduce assertion overhead
• fix insertion of fault generation node in graph that forgot the old child node input id
• fix #285 (closed), every size of data is now handled
• change getDataTypeBitWidth return type from std::size_t to std::uint8_t since supported types are not longer than 256 bits
• change getWeightsFaultsLocations and distributeFaults names and variables to be more general-purpose and add documentation
• upd: FixedNBitFlip attribute names, type and documentation to improve clarity
• change FaultLocations type to fit graph connection definition that should be added later to Aidge
• upd: ensure findProducerParamEdges returns connections with Producers
• rm: commented code and unused function declaration