Relay Monitor Relay/Builder Fuzzer

Mini "fuzzer" service to simulate invalid bids / payloads to test data collection by a relay monitor.

The service pretends to be a relay and implements just two endpoints:

1. getHeader() -> returns a signed builder bid (refer to builder-specs for structure)
2. getStatus() -> returns the status of the relay/builder

The specific faulty behavior is configurable under the builder_bid_fault field in the fuzzer config, for example:

---
...
fuzzer:
  builder_bid_fault:
    public_key:
      enabled: false
      probability: 0.5
    signature:
      enabled: false
      probability: 0.5
    parent_hash:
      enabled: false
      probability: 0.5
    randao:
      enabled: false
      probability: 0.5
    block_number:
      enabled: false
      probability: 0.5
    gas_limit:
      enabled: false
      probability: 0.5
    timestamp:
      enabled: true
      probability: 0.5
    basefee:
      enabled: false
      probability: 0.5

For each option

• enabled toggles on/off
• probability adjusts the probability of that fault being deliberately included in a signed builder bid