Move mutation_fragment_v2::kind field into mutation_fragment_v2::data.
Move mutation_fragment::kind field into mutation_fragment::data.
In both cases the move reduces size of the object by half (to 8 bytes).
On top of testsuite this patch was tested manually. First patched scylla was run. A keyspace and a table was created, with columns TEXT, INT, DOUBLE, BOOLEAN and TIMESTAMP. One row was inserted, `select *` was executed to make sure it's there. Then scylla was terminated and non-patched scylla was run, another row was inserted and `select *` was run to verify both rows exist. After this patched scylla was against started, third row was inserted and final `select *` was done to verify all three rows are there.
This is partial fix to https://github.com/scylladb/scylla-enterprise/issues/5288 issue.
Closesscylladb/scylladb#23452
* github.com:scylladb/scylladb:
Move mutation_fragment::kind into data object
Make mutation_fragment::kind enum 1 byte size
Move mutation_fragment_v2::kind into data object
Make mutation_fragment_v2::kind enum 1 byte size
e82b0dff3e