ColumnArrayT Append will move container data if it is right value

[1261385937]

Optimize ColumnArrayT::Append() to allow underlying column (e.g. ColumnString) to 'steal' values if it has r-value overload of Append() to prevent excessive copying.

[1261385937]

Actually, we has 60+ column. Most of them are large string. we use this method:

void ColumnString::Append(std::string&& steal_value) 

rather than

void ColumnString::Append(std::string_view str)

So, ColumnArrayT Append can steal value is a better choice