[Tyagiquamar]

Fixes #92.

Summary of Changes

• Updated Receiver::receive() return type from void to bool across protocol headers and implementation (proto/fbe_protocol.h, proto/fbe_protocol.cpp).
• Updated C++ code generator template in source/generator_cpp.cpp to generate bool-returning receive() methods.
• Forwarded onReceive() handler boolean return value through receive(), allowing callers to detect message handling failures and malformed payloads.

[chronoxor]

Error handling in malformed payloads is a good topic to improve. We cannot just return false in bool receive() because it accumulates buffer in chanks (what now cannot be processed, could with a next portion of data). FBE do in optimistic way assuming with have no malformed internal traffic between services.

I'll think about a good and safe way to recieve any data in Receiver and how to handle error with different strategies:

• Cancel recieving
• Reset recieve stream
• Notify on deserialization errors