More compact tuples serialization

[akudiyar]

Currently, the schema and encapsulated mappers are serialized along with each tuple. When serializing a TarantoolResult the mapper and schema may be serialized on the upper level once, assuming that all tuples in the TarantoolResult share the same schema.

PS See also perfomance and converter related issues #96 #109

[savinov]

PR relates to the issue: https://github.com/tarantool/cartridge-java/pull/86