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, 29 insertions, 0 deletions

diff --git a/yt/cpp/mapreduce/http/requests.h b/yt/cpp/mapreduce/http/requests.h
new file mode 100644
index 0000000000..2c692475d1
--- /dev/null
+++ b/yt/cpp/mapreduce/http/requests.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "fwd.h"
+#include "http.h"
+
+#include <util/generic/maybe.h>
+#include <util/str_stl.h>
+
+namespace NYT {
+
+///////////////////////////////////////////////////////////////////////////////
+
+bool ParseBoolFromResponse(const TString& response);
+
+TGUID ParseGuidFromResponse(const TString& response);
+
+////////////////////////////////////////////////////////////////////////////////
+
+TString GetProxyForHeavyRequest(const TClientContext& context);
+
+void LogRequestError(
+    const TString& requestId,
+    const THttpHeader& header,
+    const TString& message,
+    const TString& attemptDescription);
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NYT