Implement evaluating a bind_variable.
To be able to evaluate a bind_variable we need to know the type of the bound value.
This is why a data_type has been added to the bind_variable struct.
There are some quirks when evaluating a bind_variable.
The first problem occurs when the variable has been sent with an older cql serialization format and contains collections.
In that case the value has to be reserialized to use the newest cql serialization format.
The second problem occurs when there is a set or a map in the value.
The set value sent by the driver might not have the elements in the correct order, contain duplicates etc.
When a set or map is detected in the value it is reserialized as well.
collection_type_impl::reserialize doesn't work for this purpose, because it uses data_value which does not perform sorting or removal.
New code corresponds to old bind() of lists::marker in cql3/lists.cc, sets::marker etc.
Signed-off-by: Jan Ciolek <jan.ciolek@scylladb.com>
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