Extend table and schema commands

Add schema command:

• DropTableIfExists

Add helper functions to the table to add columns:

• BinaryID()
• Int()
• BigInt()
• Float()
• FixedFloat()
• Decimal()
• Varchar()
• Char()
• Text()
• Blob()
• JSON()
• Timestamp()
• Date()
• Time()
• Year()
• Binary
• Varbinary()