column_translation: store fix lengths of column values
column_translation: store fix lengths of column values

We don't need to parse the type every time.
It's better to cache fix lengths of column values
for sstable.

Signed-off-by: Piotr Jastrzebski <2c0eb4a25a7cde333ff2d0860cb06051925fd74f@scylladb.com>

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