add Nullable*Value helpers and Nullable() entrypoint for all values

Author: asmyasnikov

CHANGELOG.md

@@ -1,4 +1,5 @@
-## 3.14.5
+## 3.15.0
+* Added `table.types.Nullable{*}Value` helpers and `table.types.Nullable()` common helper
 * Fixed race on check trailer on closing table grpc-stream
 * Refactored traces (start and done struct names have prefix about trace)
 * Replaced `errors.Error`, `errors.Errorf` and `errors.ErrorfSkip` to single `errors.WithStackTrace`

internal/meta/version.go

@@ -1,5 +1,5 @@
 package meta
 
 const (
-	Version = "ydb-go-sdk/3.14.5"
+	Version = "ydb-go-sdk/3.15.0"
 )