YT-19324: move YT provider to ydb/library/yql

This commit is formed by the following script: https://paste.yandex-team.ru/6f92e4b8-efc5-4d34-948b-15ee2accd7e7/text.
This commit has zero effect on all projects that depend on YQL.

The summary of changes:
- `yql/providers/yt -> ydb/library/yql/providers/yt `- the whole implementation of YT provider is moved into YDB code base for further export as a part of YT YQL plugin shared library;
- `yql/providers/stat/{expr_nodes,uploader} -> ydb/library/yql/providers/stat/{expr_nodes,uploader}` - a small interface without implementation and the description of stat expr nodes;
- `yql/core/extract_predicate/ut -> ydb/library/yql/core/extract_predicate/ut`;
- `yql/core/{ut,ut_common} -> ydb/library/yql/core/{ut,ut_common}`;
- `yql/core` is gone;
- `yql/library/url_preprocessing -> ydb/library/yql/core/url_preprocessing`.

**NB**: all new targets inside `ydb/` are under `IF (NOT CMAKE_EXPORT)` clause which disables them from open-source cmake generation and ya make build. They will be enabled in the subsequent commits.

1 files changed, 45 insertions, 0 deletions

diff --git a/library/cpp/yt/backtrace/backtrace.h b/library/cpp/yt/backtrace/backtrace.h
new file mode 100644
index 00000000000..ea70d9558ca
--- /dev/null
+++ b/library/cpp/yt/backtrace/backtrace.h
@@ -0,0 +1,45 @@
+#pragma once
+
+#include <library/cpp/yt/memory/range.h>
+
+namespace NYT::NBacktrace {
+
+////////////////////////////////////////////////////////////////////////////////
+
+using TBacktrace = TRange<const void*>;
+using TBacktraceBuffer = TMutableRange<const void*>;
+
+//! Obtains a backtrace via a given cursor.
+/*!
+ *  \param buffer is the buffer where the backtrace is written to
+ *  \param framesToSkip is the number of top frames to skip
+ *  \returns the portion of #buffer that has actually been filled
+ */
+template <class TCursor>
+TBacktrace GetBacktrace(
+    TCursor* cursor,
+    TBacktraceBuffer buffer,
+    int framesToSkip);
+
+//! Symbolizes a backtrace invoking a given callback for each frame.
+/*!
+ *  \param backtrace Backtrace to symbolize
+ *  \param frameCallback Callback to invoke per each frame
+ */
+void SymbolizeBacktrace(
+    TBacktrace backtrace,
+    const std::function<void(TStringBuf)>& frameCallback);
+
+//! Symbolizes a backtrace to a string.
+/*!
+ *  \param backtrace Backtrace to symbolize
+ */
+TString SymbolizeBacktrace(TBacktrace backtrace);
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NYT::NBacktrace
+
+#define BACKTRACE_INL_H_
+#include "backtrace-inl.h"
+#undef BACKTRACE_INL_H_