fix(bindings): Go test compilation, Rust ffi_example, C++ include path

- Go: rewrite tests with math.Inf/NaN, fix type mismatches, fix benchmarks
- Rust: fix gf16_t formatting (.0 for UpperHex), inline bit extraction
- C++: add cpp/include to include_directories for gf16.hpp

Author: gHashTag

cpp/CMakeLists.txt

@@ -22,6 +22,7 @@ endif()
 
 # Include directory for header-only wrapper
 include_directories(
+    "${CMAKE_SOURCE_DIR}/include"
     "${CMAKE_SOURCE_DIR}/../src/c"
     "${CMAKE_SOURCE_DIR}/../../src/c"
 )