reuse same counter on all services

[zkao]

code like this is found in different places

#[derive(Debug, Default, Clone, Copy, Eq, PartialEq, PartialOrd, Hash, Display)]
#[display(Debug)]
pub struct IdCounter(u64);

impl IdCounter {
    fn increment(&mut self) -> u64 {
        self.0 += 1;
        self.0
    }
}