new(falco): implement rule selection configuration in falco.yaml

Signed-off-by: Luca Guerra <luca@guerra.sh>

userspace/engine/falco_utils.h

@@ -37,6 +37,8 @@ void readfile(const std::string& filename, std::string& data);
 
 uint32_t hardware_concurrency();
 
+bool matches_wildcard(const std::string &pattern, const std::string &s);
+
 namespace network
 {
 static const std::string UNIX_SCHEME("unix://");