Support type for type modifiers

[github-actions]

Some types could be overridden using the type modifier field within a RowDescription.
Type modifier (see pg_attribute.atttypmod). The meaning of the
modifier is type-specific.
Atttypmod records type-specific data supplied at table creation time (for
example, the maximum length of a varchar column). It is passed to
type-specific input functions and length coercion functions. The value
will generally be -1 for types that do not need atttypmod.

https://www.postgresql.org/docs/current/protocol-message-formats.html
https://www.postgresql.org/docs/current/catalog-pg-attribute.html

Line: 73

psql-wire//row.go

Lines 70 to 80 in 3dbc832

	writer.AddInt16(column.AttrNo)
	writer.AddInt32(int32(column.Oid))
	writer.AddInt16(column.Width)
	// TODO: Support type for type modifiers
	//
	// Some types could be overridden using the type modifier field within a RowDescription.
	// Type modifier (see pg_attribute.atttypmod). The meaning of the
	// modifier is type-specific.
	// Atttypmod records type-specific data supplied at table creation time (for
	// example, the maximum length of a varchar column). It is passed to
	// type-specific input functions and length coercion functions. The value