feat: mev-builder

* consesus: add a interface to set validator at runtime
* core/txpool: add bundlepool to maintain bundle txs
* core/type: define bundle
* internal/ethapi: add sendBundle, bundlePrice, unregis
* ethclient: add SendBundle
* miner: add fillTransacitonsAndBundles, add Bidder to sendBid to validators
* add README.builder.md

README.builder.md

@@ -0,0 +1,42 @@
+[bsc readme](README.original.md)
+
+# BSC Builder
+
+This project implements the BEP-322: Builder API Specification for BNB Smart Chain.
+
+This project represents a minimal implementation of the protocol and is provided as is. We make no guarantees regarding its functionality or security.
+
+See also: https://github.com/bnb-chain/BEPs/pull/322
+
+# Usage
+
+Builder-related settings are configured in the `config.toml` file. The following is an example of a `config.toml` file:
+
+```
+[Eth.Miner.Bidder]
+Enable = true
+Account = {{BUILDER_ADDRESS}}
+DelayLeftOver = {{DELAY_LEFT_OVER}}
+
+[[Eth.Miner.Bidder.Validators]]
+Address = {{VALIDATOR_ADDRESS}}
+URL = {{VALIDATOR_URL}}
+...
+```
+
+- `Enable`: Whether to enable the builder.
+- `Account`: The account address to unlock of the builder.
+- `DelayLeftOver`: Submit bid no later than `DelayLeftOver` before the next block time.
+- `Validators`: A list of validators to bid for.
+  - `Address`: The address of the validator.
+  - `URL`: The URL of the validator.
+
+## License
+
+The bsc library (i.e. all code outside of the `cmd` directory) is licensed under the
+[GNU Lesser General Public License v3.0](https://www.gnu.org/licenses/lgpl-3.0.en.html),
+also included in our repository in the `COPYING.LESSER` file.
+
+The bsc binaries (i.e. all code inside of the `cmd` directory) is licensed under the
+[GNU General Public License v3.0](https://www.gnu.org/licenses/gpl-3.0.en.html), also
+included in our repository in the `COPYING` file.

consensus/consensus.go

@@ -160,4 +160,5 @@ type PoSA interface {
 	GetFinalizedHeader(chain ChainHeaderReader, header *types.Header) *types.Header
 	VerifyVote(chain ChainHeaderReader, vote *types.VoteEnvelope) error
 	IsActiveValidatorAt(chain ChainHeaderReader, header *types.Header, checkVoteKeyFn func(bLSPublicKey *types.BLSPublicKey) bool) bool
+	SetValidator(validator common.Address)
 }

consensus/parlia/parlia.go

@@ -1878,6 +1878,17 @@ func (p *Parlia) GetFinalizedHeader(chain consensus.ChainHeaderReader, header *t
 	return chain.GetHeader(snap.Attestation.SourceHash, snap.Attestation.SourceNumber)
 }
 
+// SetValidator set the validator of parlia engine
+// It is used for builder
+func (p *Parlia) SetValidator(val common.Address) {
+	if val == (common.Address{}) {
+		return
+	}
+	p.lock.Lock()
+	defer p.lock.Unlock()
+	p.val = val
+}
+
 // ===========================     utility function        ==========================
 func (p *Parlia) backOffTime(snap *Snapshot, header *types.Header, val common.Address) uint64 {
 	if snap.inturn(val) {