Improve the seeder to generate different distributions of big values

[kostasrim]

• remove the serialization_max_chunk_size=1 from regression tests
• add seeder support for generating different distributions of big values
• use the seeder to add tests for big values

Once these are added also revamp the test test_network_disconnect_during_migration to use the new seeder. For more info: https://github.com/dragonflydb/dragonfly/pull/4144#discussion_r1850130930