all: make timestamp-based fork checks based on uint64 (#26474)

This PR changes the API so that uint64 is used for fork timestamps.
It's a good choice because types.Header also uses uint64 for time.

Co-authored-by: Felix Lange <fjl@twurst.com>

eth/ethconfig/config.go

@@ -18,7 +18,6 @@
 package ethconfig
 
 import (
-	"math/big"
 	"os"
 	"os/user"
 	"path/filepath"
@@ -207,7 +206,7 @@ type Config struct {
 	CheckpointOracle *params.CheckpointOracleConfig `toml:",omitempty"`
 
 	// OverrideShanghai (TODO: remove after the fork)
-	OverrideShanghai *big.Int `toml:",omitempty"`
+	OverrideShanghai *uint64 `toml:",omitempty"`
 }
 
 // CreateConsensusEngine creates a consensus engine for the given chain configuration.

eth/ethconfig/gen_config.go

@@ -3,7 +3,6 @@
 package ethconfig
 
 import (
-	"math/big"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -61,7 +60,7 @@ func (c Config) MarshalTOML() (interface{}, error) {
 		RPCTxFeeCap             float64
 		Checkpoint              *params.TrustedCheckpoint      `toml:",omitempty"`
 		CheckpointOracle        *params.CheckpointOracleConfig `toml:",omitempty"`
-		OverrideShanghai        *big.Int                       `toml:",omitempty"`
+		OverrideShanghai        *uint64                        `toml:",omitempty"`
 	}
 	var enc Config
 	enc.Genesis = c.Genesis
@@ -155,7 +154,7 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 		RPCTxFeeCap             *float64
 		Checkpoint              *params.TrustedCheckpoint      `toml:",omitempty"`
 		CheckpointOracle        *params.CheckpointOracleConfig `toml:",omitempty"`
-		OverrideShanghai        *big.Int                       `toml:",omitempty"`
+		OverrideShanghai        *uint64                        `toml:",omitempty"`
 	}
 	var dec Config
 	if err := unmarshal(&dec); err != nil {