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

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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, 25 insertions, 0 deletions

diff --git a/yt/cpp/mapreduce/client/py_helpers.h b/yt/cpp/mapreduce/client/py_helpers.h
new file mode 100644
index 0000000000..85aa0a93f3
--- /dev/null
+++ b/yt/cpp/mapreduce/client/py_helpers.h
@@ -0,0 +1,25 @@
+#include <yt/cpp/mapreduce/interface/client_method_options.h>
+#include <yt/cpp/mapreduce/interface/operation.h>
+
+namespace NYT {
+
+////////////////////////////////////////////////////////////////////////////////
+
+using IStructuredJobPtr = TIntrusiveConstPtr<IStructuredJob>;
+
+IStructuredJobPtr ConstructJob(const TString& jobName, const TString& state);
+
+TString GetJobStateString(const IStructuredJob& job);
+
+TString GetIOInfo(
+    const IStructuredJob& job,
+    const TCreateClientOptions& options,
+    const TString& cluster,
+    const TString& transactionId,
+    const TString& inputPaths,
+    const TString& outputPaths,
+    const TString& neededColumns);
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NYT