sql: enable alter rename table

Added new opcode OP_RenameTable, which implements
SQL statment: ALTER TABLE old_name RENAME TO new_name;
The main idea is to replace corresponding tuple in _space.
New tuple will contain new name and new SQL statement, which
creates this table. If it is parent table for foreign key,
update SQL statement of child table. Then, remove old name
from hash table and by calling callback function from VDBE,
update database schema with new table name. After all,
in the same way update triggers' statements in _trigger table,
if any exist.

Closes #2204