core(tls): implement releasing of TLS on thread termination

- move TLS & instrumentation code out of core/utility.hpp
- (*) TLSData lost .gather() method (to dispose thread data on thread termination)
- use TLSDataAccumulator for reliable collecting of thread data
- prefer using of .detachData() + .cleanupDetachedData() instead of .gather() method

(*) API is broken: replace TLSData => TLSDataAccumulator if gather required
(objects disposal on threads termination is not available in accumulator mode)

modules/core/test/test_utils.cpp

@@ -4,6 +4,8 @@
 #include "test_precomp.hpp"
 #include "opencv2/core/utils/logger.hpp"
 
+#include "test_utils_tls.impl.hpp"
+
 namespace opencv_test { namespace {
 
 static const char * const keys =