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, 26 insertions, 0 deletions

diff --git a/yt/cpp/mapreduce/http/fwd.h b/yt/cpp/mapreduce/http/fwd.h
new file mode 100644
index 00000000000..62891731f6c
--- /dev/null
+++ b/yt/cpp/mapreduce/http/fwd.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#include <memory>
+
+namespace NYT {
+
+////////////////////////////////////////////////////////////////////////////////
+
+struct TClientContext;
+class THttpHeader;
+
+namespace NHttpClient {
+
+class IHttpClient;
+class IHttpRequest;
+class IHttpResponse;
+
+using IHttpClientPtr = std::shared_ptr<IHttpClient>;
+using IHttpResponsePtr = std::unique_ptr<IHttpResponse>;
+using IHttpRequestPtr = std::unique_ptr<IHttpRequest>;
+
+} // namespace NHttpClient
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NYT