feat: allow for an address space u0 in memory,input,ouput

[amkCha]

pub input r() -> (b:u2)
pub output o(b:u1) -> (b:u2)
fn main() {
  o[0] = r[]
}

gives out

panic: runtime error: index out of range [0] with length 0 [recovered]
	panic: runtime error: index out of range [0] with length 0

and this

pub input r() -> (b:u32)
pub output o(b:u1) -> (b:u32)
fn main() {
  o[0] = r[0]
}

gives out

too many arguments (expected 0)

  o[0] = r[0]
         ^^^^