Support ALTER COLUMN RESTART WITH

As a replacement for the broken `sys.alter_seq_restart` stored procedure. For general, non-identity sequence changes we'll probably just want to implement ALTER SEQUENCE.

Also remove support for SET INCREMENT BY because it didn't actually work and not straight forward to do.
Alright, then maybe set of test cases that starts with `START WITH 10` `RESTART WITH {0|1|9|11}` or a comment here.