op-sync-tester: Customizable Test Sessions (Fault Injection & Latency)

While initializing the sync tester session, we may initialize session with the RPCs to return faulty response or injecting artificial latency.

For example, initializing with
```
/chain/{chain_id}/synctest/{session_id}?latest=100&safe=95&finalized=90&fault=90&latency=0.5
```

means all the RPCs return fault response in the probability of 90%, with extra latency by 0.5 second added.

Heavily inspired from the `ChaoticEngine`:
https://github.com/ethereum-optimism/optimism/blob/fc66fbed47fdc2cb15bc0c108c509029645e2f04/op-node/rollup/sequencing/sequencer_chaos_test.go#L28-L50