chore: Rename CamelCase namespaces to snake_case (#7933)

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

tests/conan/src/example.cpp

@@ -5,6 +5,6 @@
 int
 main(int argc, char const** argv)
 {
-    std::printf("%s\n", xrpl::BuildInfo::getVersionString().c_str());
+    std::printf("%s\n", xrpl::build_info::getVersionString().c_str());
     return 0;
 }