mutation_reader: Introduce concept of snapshot_source
mutation_reader: Introduce concept of snapshot_source

duarten/scylla,scylladb/scylla,duarten/scylla,avikivity/scylla,avikivity/scylla,duarten/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla