fix: panic on overflow in release mode

[stringhandler]

Description

Add a toml config to do the same overflow/underflow check in debug mode in release mode.

Motivation and Context

By default, Rust will wrap an integer in release mode instead of throwing the overflow error seen in debug mode. Panicking at this time is better than silently using the wrong value. IMO this could lead to all sorts of exploits.

Some Tari specific background:
In the MMR crate there is this check:

       let peaks = find_peaks(mmr_size);
        let mut peak_hashes = Vec::with_capacity(peaks.len() - 1);

We found in testing that on some machines this would panic and others would pass. (I can't remember if it was this exact line, since this should fail with allocating that much memory)

How Has This Been Tested?

Checked on rust pen to confirm that rust underflows in release mode with this code

fn main() {
   let vec: Vec<u8> = Vec::new();
   let val =  vec.len() - 1;
   println!("{}", val);
}

[hansieodendaal]

LGTM - totally agree

[hansieodendaal]

utACK