Fix Windows registry name crashes (netdata#20097)

* Fix Windows registry name crashes and optimize memory with Judy arrays

This commit addresses two key issues with Windows performance counter registry handling:

1. Fixes crashes due to improper registry data parsing:
   - Added comprehensive validation of registry data structure
   - Added bounds checking to prevent buffer overruns
   - Added validation of ID string conversion
   - Improved error logging for malformed registry entries

2. Optimizes memory usage with Judy arrays:
   - Replaced fixed-size array with memory-efficient Judy array
   - Memory usage now scales with actual data rather than highest ID
   - Eliminated arbitrary limit on registry ID values
   - Added proper resource cleanup on shutdown

Added unit tests to verify functionality and demonstrate memory efficiency
with sparseness statistics. Run with: -W perflibnamestest

* Enhance Windows registry validation and add comprehensive tests

Author: ktsaou

src/collectors/windows.plugin/windows_plugin.c

@@ -122,6 +122,9 @@ static void windows_main_cleanup(void *pptr)
 
     static_thread->enabled = NETDATA_MAIN_THREAD_EXITING;
 
+    // Cleanup registry resources
+    PerflibNamesRegistryCleanup();
+
     static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
 
     worker_unregister();

src/daemon/main.c

@@ -404,6 +404,9 @@ int netdata_main(int argc, char **argv) {
                             if (dyncfg_unittest()) return 1;
                             if (unittest_waiting_queue()) return 1;
                             if (uuidmap_unittest()) return 1;
+#ifdef OS_WINDOWS
+                            if (perflibnamestest_main()) return 1;
+#endif
                             sqlite_library_shutdown();
                             fprintf(stderr, "\n\nALL TESTS PASSED\n\n");
                             return 0;
@@ -455,6 +458,10 @@ int netdata_main(int argc, char **argv) {
                         else if(strcmp(optarg, "perflibdump") == 0) {
                             return windows_perflib_dump(optind + 1 > argc ? NULL : argv[optind]);
                         }
+                        else if(strcmp(optarg, "perflibnamestest") == 0) {
+                            unittest_running = true;
+                            return perflibnamestest_main();
+                        }
 #endif
 #ifdef ENABLE_DBENGINE
                         else if(strcmp(optarg, "mctest") == 0) {

src/daemon/unit_test.h

@@ -23,4 +23,8 @@ void dbengine_stress_test(unsigned TEST_DURATION_SEC, unsigned DSET_CHARTS, unsi
 
 bool command_argument_sanitization_tests();
 
+#ifdef OS_WINDOWS
+int perflibnamestest_main(void);
+#endif
+
 #endif /* NETDATA_UNIT_TEST_H */