box: forbid DDL operations until box.schema.upgrade

Currently, in case of recovery from an old snapshot, Tarantool allows to
perform DDL operations on an instance with non-upgraded schema.
It leads to various unpredictable errors (because the DDL code assumes
that the schema is already upgraded). This patch forbids the following
operations unless the user has the most recent schema version:
- box.schema.space.create
- box.schema.space.drop
- box.schema.space.alter
- box.schema.index.create
- box.schema.index.drop
- box.schema.index.alter
- box.schema.sequence.create
- box.schema.sequence.drop
- box.schema.sequence.alter
- box.schema.func.create
- box.schema.func.drop

Closes #7149

NO_DOC=bugfix