new: hardware_concurrency helper

Co-authored-by: Lorenzo Fontana <lo@linux.com>
Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>

userspace/engine/falco_utils.h

@@ -21,6 +21,7 @@ limitations under the License.
 #include <fstream>
 #include <iostream>
 #include <string>
+#include <thread>
 #include <nonstd/string_view.hpp>
 
 #pragma once
@@ -34,6 +35,9 @@ namespace utils
 std::string wrap_text(const std::string& str, uint32_t initial_pos, uint32_t indent, uint32_t line_len);
 
 void readfile(const std::string& filename, std::string& data);
+
+uint32_t hardware_concurrency();
+
 namespace network
 {
 static const std::string UNIX_SCHEME("unix://");