chore: remove unused deps

[ntn-x2]

WIP.

Checklist

Make sure the following combinations work as expected, as they are the most useful ones:

• [ ] --all-targets: no default features, this is the final WASM that is deployed
• [ ] --all-targets --all-features: all features enabled, which can reduce our compile times by eliminating unnecessary dependencies

[ntn-x2]

Problem I'm having is with a dev dependency that is only used when the benchmarks are being tested. This is currently not possible to remove, hence I was thinking to either add a new feature and make the dependency a regular optional dependency instead of a dev one, or then just try what other tools like cargo-udeps and cargo-machete yield. This is low priority but still somehow important to reduce the size of our WASM, binaries and bring down compilation times.

[Dudleyneedham]

@Antonio what is the status of this?

[ntn-x2]

Will pick it up again at some point, probably next week.

[ntn-x2]

Closing for now. Will make a proper ticket to track this.