Add numeric operators to TypedColumn

[chuwy]

Currently it has only universal equality:

skunk-tables/core/src/main/scala/skunk/tables/TypedColumn.scala

Lines 46 to 47 in a9754af

	infix def ==(c: A): TypedColumn.Op[A] =
	TypedColumn.Op(sql"#$n = ${primitive.codec}", c)

At least:

• >
• <
• >=
• <=