[Feature Request] create larger gap between existing and new feature flag numbers

[andygolay]

🚀 Feature Request

As we add new feature flags, eg the DECOMMISSION_CORE_RESOURCES flag introduced in #160, we should have a larger gap between existing flags from Aptos, so our new flags don't collide with theirs.

We can count down from i32::MAX as the Rust-side number assignment is expressed as enum discriminant.

So, for example we should change DECOMMISSION_CORE_RESOURCES from 222 accordingly.

And we should see whether it's possible to change the numbers for all feature flags we've added.

[0xmovses]

Maybe we don't want onchain randomness feature.