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, 39 insertions, 0 deletions

diff --git a/library/cpp/skiff/skiff_validator.h b/library/cpp/skiff/skiff_validator.h
new file mode 100644
index 0000000000..522cc74db6
--- /dev/null
+++ b/library/cpp/skiff/skiff_validator.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#include "public.h"
+
+#include "skiff_schema.h"
+
+#include <util/string/cast.h>
+
+namespace NSkiff {
+
+////////////////////////////////////////////////////////////////////////////////
+
+class TValidatorNodeStack;
+
+////////////////////////////////////////////////////////////////////////////////
+
+class TSkiffValidator
+{
+public:
+    explicit TSkiffValidator(std::shared_ptr<TSkiffSchema> skiffSchema);
+    ~TSkiffValidator();
+
+    void BeforeVariant8Tag();
+    void OnVariant8Tag(ui8 tag);
+
+    void BeforeVariant16Tag();
+    void OnVariant16Tag(ui16 tag);
+
+    void OnSimpleType(EWireType value);
+
+    void ValidateFinished();
+
+private:
+    const std::unique_ptr<TValidatorNodeStack> Context_;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NSkiff