pmt: fix memory leaks, and improve info function

- Removed --no-write-test argument of memory test function
 - Fixed memory leak of memory test function
 - Improved info function with using nlohmann/json header-only library
 - Some other improvents

srclib/libpartition_map/include/libpartition_map/lib.hpp

@@ -118,6 +118,7 @@ public:
   [[nodiscard]] constant_iterator cend() const;
 };
 
+using Partition_t = _entry;
 using Map_t = basic_partition_map;
 
 class basic_partition_map_builder final {