* feat: generate random user handles with random-name-generator * feat: use random-name-combiner for user handles * feat: use random-name-generator Combination for user handles * chore: update composer.lock for random-name-generator Combination * feat: use Platoniq package * feat: centralise user handle validation in UserHandle constraint * feat: use platoniq/random-name-generator v1.0 * feat: increase uniqueness test size to 128 samples --------- Co-authored-by: Daniel Subiabre <daniel.subiabre@platoniq.net>