## Description 

Surfer: add a Move module for testing random

## Test Plan 

Manually with 
`cargo run --release --bin sui-surfer -- --packages
crates/sui-surfer/tests/random --run-duration 100 --epoch-duration 20`

---
If your changes are not user-facing and do not break anything, you can
skip the following section. Otherwise, please briefly describe what has
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### Type of Change (Check all that apply)

- [ ] protocol change
- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes