Add preset builders to the default config (#290)

## 📝 Summary

Currently, users need to manually configure block builders by writing
out full builder configurations. However, there are only a limited
number of meaningful builder configurations that make sense in practice
and are allowed on the builder algos. Having users write custom
configurations is unnecessary complexity when we can provide all the
practical presets out of the box.

This PR provides all the meaningful builder configurations as
ready-to-use presets. Users can simply enable the builders they need
instead of dealing with detailed configuration. This PR is backwards
compatible, the users can still provide their own builder
configurations.

## 💡 Motivation and Context

<!--- (Optional) Why is this change required? What problem does it
solve? Remove this section if not applicable. -->

---

## ✅ I have completed the following steps:

* [x] Run `make lint`
* [x] Run `make test`
* [x] Added tests (if applicable)

config-playground.toml

@@ -25,27 +25,11 @@ dry_run_validation_url = "http://localhost:8545"
 ignore_cancellable_orders = true
 
 sbundle_mergeabe_signers = []
-live_builders = ["mp-ordering"]
+live_builders = ["mp-ordering", "mgp-ordering", "parallel"]
 
 [[relays]]
 name = "custom"
 url = "http://0xac6e77dfe25ecd6110b8e780608cce0dab71fdd5ebea22a16c0205200f2f8e2e3ad3b71d3499c54ad14d6c21b41a37ae@localhost:5555"
 priority = 0
 use_ssz_for_submit = false
 use_gzip_for_submit = false
-
-[[builders]]
-name = "mgp-ordering"
-algo = "ordering-builder"
-discard_txs = true
-sorting = "mev-gas-price"
-failed_order_retries = 1
-drop_failed_orders = true
-
-[[builders]]
-name = "mp-ordering"
-algo = "ordering-builder"
-discard_txs = true
-sorting = "max-profit"
-failed_order_retries = 1
-drop_failed_orders = true

crates/rbuilder/src/live_builder/config.rs

@@ -422,6 +422,47 @@ impl Default for Config {
                         build_duration_deadline_ms: None,
                     }),
                 },
+                BuilderConfig {
+                    name: String::from("mp-ordering-deadline"),
+                    builder: SpecificBuilderConfig::OrderingBuilder(OrderingBuilderConfig {
+                        discard_txs: true,
+                        sorting: Sorting::MaxProfit,
+                        failed_order_retries: 1,
+                        drop_failed_orders: true,
+                        coinbase_payment: false,
+                        build_duration_deadline_ms: Some(30),
+                    }),
+                },
+                BuilderConfig {
+                    name: String::from("mp-ordering-cb"),
+                    builder: SpecificBuilderConfig::OrderingBuilder(OrderingBuilderConfig {
+                        discard_txs: true,
+                        sorting: Sorting::MaxProfit,
+                        failed_order_retries: 1,
+                        drop_failed_orders: true,
+                        coinbase_payment: true,
+                        build_duration_deadline_ms: None,
+                    }),
+                },
+                BuilderConfig {
+                    name: String::from("mgp-ordering-default"),
+                    builder: SpecificBuilderConfig::OrderingBuilder(OrderingBuilderConfig {
+                        discard_txs: true,
+                        sorting: Sorting::MevGasPrice,
+                        failed_order_retries: 1,
+                        drop_failed_orders: false,
+                        coinbase_payment: false,
+                        build_duration_deadline_ms: None,
+                    }),
+                },
+                BuilderConfig {
+                    name: String::from("parallel"),
+                    builder: SpecificBuilderConfig::ParallelBuilder(ParallelBuilderConfig {
+                        discard_txs: true,
+                        num_threads: 25,
+                        coinbase_payment: false,
+                    }),
+                },
             ],
         }
     }