Method getMaximumUsage

src/common/classes/alloc.h:97–97

	size_t getCurrentUsage() const noexcept { return mst_usage.value(); }
	size_t getMaximumUsage() const noexcept { return mst_max_usage; }
	size_t getCurrentMapping() const noexcept { return mst_mapped.value(); }
	size_t getMaximumMapping() const noexcept { return mst_max_mapped; }