Advance coordinator implementation

- Common
	- Move ErrTODO and ErrDone to common for usage where needed.
- Coordinator
	- Move prover types to prover package
	- Handle reorgs, stopping the pipeline when necessary
	- Handle ethereum transaction errors by stopping the pipeline
	- In case of ethereum transaction revert, check for known revert causes
	  (more revert causes can be added to handle more cases)
	- Fix skipped transactions in TxManager confirmation logic
	- Cancel and wait for provers to be ready
	- Connect L2DB to:
		- purge l2txs due to timeout
		- mark l2txs at the different states
	- Connect HistoryDB to query L1UserTxs to forge in an L1Batch
- L2DB
	- Skip update functions when the input slices have no values (to avoid a
	  query with no values that results in an SQL error)
- StateDB
	- In LocalStateDB, fix Reset when mt == nil
- Prover (new package)
	- Rename the interface to Prover
	- Rename the mock struct to Mock
	- Extend Prover interface methods to provide everything required by the
	  coordinator
	- Begin implementing required http client code to interact with server
	  proof (not tested)
- Synchronizer:
	- Add LastForgeL1TxsNum to Stats
- Test/Client
	- Update Auction logic to track slots in which there's no forge during
	  the time before the deadline (following the solidity implementation)

common/errors.go

@@ -1,6 +1,10 @@
 package common
 
-import "errors"
+import (
+	"errors"
+
+	"github.com/hermeznetwork/tracerr"
+)
 
 // ErrNotInFF is used when the *big.Int does not fit inside the Finite Field
 var ErrNotInFF = errors.New("BigInt not inside the Finite Field")
@@ -16,3 +20,14 @@ var ErrIdxOverflow = errors.New("Idx overflow, max value: 2**48 -1")
 
 // ErrBatchQueueEmpty is used when the coordinator.BatchQueue.Pop() is called and has no elements
 var ErrBatchQueueEmpty = errors.New("BatchQueue empty")
+
+// ErrTODO is used when a function is not yet implemented
+var ErrTODO = errors.New("TODO")
+
+// ErrDone is used when a function returns earlier due to a cancelled context
+var ErrDone = errors.New("done")
+
+// IsErrDone returns true if the error or wrapped (with tracerr) error is ErrDone
+func IsErrDone(err error) bool {
+	return tracerr.Unwrap(err) == ErrDone
+}

common/ethauction.go

@@ -6,6 +6,12 @@ import (
 	ethCommon "github.com/ethereum/go-ethereum/common"
 )
 
+const (
+	// AuctionErrMsgCannotForge is the message returned in forge with the
+	// address cannot forge
+	AuctionErrMsgCannotForge = "HermezAuctionProtocol::forge: CANNOT_FORGE"
+)
+
 // AuctionConstants are the constants of the Rollup Smart Contract
 type AuctionConstants struct {
 	// Blocks per slot