YT-19210: expose YQL shared library for YT.

After this, a new target libyqlplugin.so appears. in open-source cmake build.
Diff in open-source YDB repo looks like the following: https://paste.yandex-team.ru/f302bdb4-7ef2-4362-91c7-6ca45f329264

1 files changed, 95 insertions, 0 deletions

diff --git a/yt/cpp/mapreduce/client/transaction.h b/yt/cpp/mapreduce/client/transaction.h
new file mode 100644
index 00000000000..559fca619e9
--- /dev/null
+++ b/yt/cpp/mapreduce/client/transaction.h
@@ -0,0 +1,95 @@
+#pragma once
+
+#include "abortable_registry.h"
+
+#include <yt/cpp/mapreduce/http/requests.h>
+#include <yt/cpp/mapreduce/http/retry_request.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/maybe.h>
+#include <util/generic/ptr.h>
+#include <util/system/thread.h>
+
+#include <atomic>
+
+namespace NYT {
+
+////////////////////////////////////////////////////////////////////////////////
+
+class TPingableTransaction
+{
+public:
+    //
+    // Start a new transaction.
+    TPingableTransaction(
+        const IClientRetryPolicyPtr& retryPolicy,
+        const TClientContext& context,
+        const TTransactionId& parentId,
+        ITransactionPingerPtr transactionPinger,
+        const TStartTransactionOptions& options);
+
+    //
+    // Attach to an existing transaction.
+    TPingableTransaction(
+        const IClientRetryPolicyPtr& retryPolicy,
+        const TClientContext& context,
+        const TTransactionId& transactionId,
+        ITransactionPingerPtr transactionPinger,
+        const TAttachTransactionOptions& options);
+
+    ~TPingableTransaction();
+
+    const TTransactionId GetId() const;
+
+    const std::pair<TDuration, TDuration> GetPingInterval() const;
+    const TClientContext GetContext() const;
+
+    void Commit();
+    void Abort();
+    void Detach();
+
+
+private:
+    enum class EStopAction
+    {
+        Detach,
+        Abort,
+        Commit,
+    };
+
+private:
+    IClientRetryPolicyPtr ClientRetryPolicy_;
+    TClientContext Context_;
+    TTransactionId TransactionId_;
+    TDuration MinPingInterval_;
+    TDuration MaxPingInterval_;
+
+    // We have to own an IntrusivePtr to registry to prevent use-after-free.
+    ::TIntrusivePtr<NDetail::TAbortableRegistry> AbortableRegistry_;
+
+    bool AbortOnTermination_;
+
+    bool AutoPingable_;
+    bool Finalized_ = false;
+    ITransactionPingerPtr Pinger_;
+
+private:
+    void Init(
+        const TClientContext& context,
+        const TTransactionId& transactionId,
+        TDuration timeout);
+
+    void Stop(EStopAction action);
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+TYPath Snapshot(
+    const IClientRetryPolicyPtr& clientRetryPolicy,
+    const TClientContext& context,
+    const TTransactionId& transactionId,
+    const TYPath& path);
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NYT