perf: introduce /% zkc operator

[letypequividelespoubelles]

When there is division and a remainder:

• within the same vector
• with the same registers (or constants) input

The hint for a division already produces the quotient and the remainder. No need to compute it twice for the two operations.

Then instead of creating two divison / remainder lowering pass, we should do only one:

fn div_and_remain(a:u8, b:u8) -> (q:u8, r:u8) {
q = a / b
r = a % b
}

is now compiling to:

fn div_and_remain(u8 a, u8 b) -> (u8 q, u8 r) {
        u8 $4
        u8 $5
        u8 $6
        u0 $7
        u0 $8
        u8 $9
        u8 $10
        u8 $11
        u0 $12
        u0 $13
[0]     q, $4, $5 = hint(a, b) ; $6 = q * b * 0x1 ; $7 = a - $6 - $4 ; $8 = b - $4 - $5 - 0x1 ; $9, r, $10 = hint(a, b) ; $11 = $9 * b * 0x1 ; $12 = a - $11 - r ; $13 = b - r - $10 - 0x1 ; ret
}

but should be only:

fn div_and_remain(u8 a, u8 b) -> (u8 q, u8 r) {
        u8 $5
        u8 $6
        u0 $7
        u0 $8
[0]     q, r, $5 = hint(a, b) ; $6 = q * b * 0x1 ; $7 = a - $6 - $4 ; $8 = b - $4 - $5 - 0x1 ; ret
}