[library/cpp/logger] Support meta flags with TLogElement

Support opportunity to use TMetaFlags with TLogElement.

**Use example:**
`Log().With("Property", "Value").With("Code", "Code") << LogMessage`

Such interface allows to not parse required by TLogBackend  properties from raw string.

1 files changed, 2 insertions, 1 deletions

diff --git a/library/cpp/logger/element.cpp b/library/cpp/logger/element.cpp
index b510fe16e1..ecce365f1f 100644
--- a/library/cpp/logger/element.cpp
+++ b/library/cpp/logger/element.cpp
@@ -3,6 +3,7 @@
 
 #include <utility>
 
+
 TLogElement::TLogElement(const TLog* parent)
     : Parent_(parent)
     , Priority_(Parent_->DefaultPriority())
@@ -32,7 +33,7 @@ void TLogElement::DoFlush() {
     const size_t filled = Filled();
 
     if (filled) {
-        Parent_->Write(Priority_, Data(), filled);
+        Parent_->Write(Priority_, Data(), filled, std::move(Context_));
         Reset();
     }
 }