Move nickname derivation code into nucypher-core?

[fjarri]

Nickname derivation in nucypher (from staker addresses/fleet state checksums, see https://github.com/nucypher/nucypher/blob/main/nucypher/acumen/nicknames.py) is non-trivial to reproduce in other languages (although possible). Should we move it into this crate? In case nucypher-ts wants to use it.

[theref]

I haven't had a proper read through the source code yet, but this is probably a good place to start https://github.com/healeycodes/niceware

[fjarri]

Another possibility is RFC 1751. Our current nicknames cover about 25 bits of space, so 2 words from niceware or 3 words from the RFC will be enough.

EDIT: or the standard mnemonic generation can be used too. The reason the current scheme was chosen in the first place is because it can be tied to colors and not just words and abbreviated conveniently as an "icon" (2 letters + 2 colors).