ColumnNulableT and wrap for LowCardinalityT

[den818]

The main purpose to make easier work with nullable and low cardinality columns.
The target examples of code:

Nullable

auto column = std::make_shared<ColumnNullableT<ColumnInt32>>();
column->Append(1);
column->Append(2);
column->Append(std::nullopt);

LowCardinality Nullable String

auto column = std::make_shared<ColumnLowCardinalityT<ColumnNullableT<ColumnString>>>();
column->Append("abc");
column->Append("def");
column->Append("abc");
column->Append("abc");
column->Append(std::nullopt);
column->Append(std::nullopt);

And also WrapCollumn to transform from ColumnNullable and ColumnLowCardinality to ColumnNullableT and ColumnLowCardinalityT