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

This commit is formed by the following script: https://paste.yandex-team.ru/6f92e4b8-efc5-4d34-948b-15ee2accd7e7/text.
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.

2 files changed, 59 insertions, 0 deletions

diff --git a/library/cpp/yt/cpu_clock/unittests/clock_ut.cpp b/library/cpp/yt/cpu_clock/unittests/clock_ut.cpp
new file mode 100644
index 0000000000..bd9cb6d4be
--- /dev/null
+++ b/library/cpp/yt/cpu_clock/unittests/clock_ut.cpp
@@ -0,0 +1,46 @@
+#include <gtest/gtest.h>
+
+#include <library/cpp/yt/cpu_clock/clock.h>
+
+namespace NYT {
+namespace {
+
+////////////////////////////////////////////////////////////////////////////////
+
+template <class T>
+i64 DiffMS(T a, T b)
+{
+    return a >= b
+        ? static_cast<i64>(a.MilliSeconds()) - static_cast<i64>(b.MilliSeconds())
+        : DiffMS(b, a);
+}
+
+TEST(TTimingTest, GetInstant)
+{
+    GetInstant();
+
+    EXPECT_LE(DiffMS(GetInstant(), TInstant::Now()), 10);
+}
+
+TEST(TTimingTest, InstantVSCpuInstant)
+{
+    auto instant1 = TInstant::Now();
+    auto cpuInstant = InstantToCpuInstant(instant1);
+    auto instant2 = CpuInstantToInstant(cpuInstant);
+    EXPECT_LE(DiffMS(instant1, instant2), 10);
+}
+
+TEST(TTimingTest, DurationVSCpuDuration)
+{
+    auto cpuInstant1 = GetCpuInstant();
+    constexpr auto duration1 = TDuration::MilliSeconds(100);
+    Sleep(duration1);
+    auto cpuInstant2 = GetCpuInstant();
+    auto duration2 = CpuDurationToDuration(cpuInstant2 - cpuInstant1);
+    EXPECT_LE(DiffMS(duration1, duration2), 10);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace
+} // namespace NYT
diff --git a/library/cpp/yt/cpu_clock/unittests/ya.make b/library/cpp/yt/cpu_clock/unittests/ya.make
new file mode 100644
index 0000000000..921087c295
--- /dev/null
+++ b/library/cpp/yt/cpu_clock/unittests/ya.make
@@ -0,0 +1,13 @@
+GTEST()
+
+INCLUDE(${ARCADIA_ROOT}/library/cpp/yt/ya_cpp.make.inc)
+
+SRCS(
+    clock_ut.cpp
+)
+
+PEERDIR(
+    library/cpp/yt/cpu_clock
+)
+
+END()