Added name, seating capacity, and active status for tables

For the convenience of online booking, information about tables can now be accompanied not only by a number but also by a textual name (description) and the number of seats. In addition, a frustrating oversight has been eliminated, which made it impossible to distinguish an active table from an inactive one (marked as deleted).

The type ITable has acquired new fields:

• Name — name,
• SeatingCapacity — seating capacity,
• IsActive — whether the table is active.