cmd/evm: support shanghai in tests + evm t8n (ethereum#26458)

Author: marioevz

tests/init.go

@@ -248,6 +248,24 @@ var Forks = map[string]*params.ChainConfig{
 		MergeNetsplitBlock:      big.NewInt(0),
 		TerminalTotalDifficulty: big.NewInt(0),
 	},
+	"Shanghai": {
+		ChainID:                 big.NewInt(1),
+		HomesteadBlock:          big.NewInt(0),
+		EIP150Block:             big.NewInt(0),
+		EIP155Block:             big.NewInt(0),
+		EIP158Block:             big.NewInt(0),
+		ByzantiumBlock:          big.NewInt(0),
+		ConstantinopleBlock:     big.NewInt(0),
+		PetersburgBlock:         big.NewInt(0),
+		IstanbulBlock:           big.NewInt(0),
+		MuirGlacierBlock:        big.NewInt(0),
+		BerlinBlock:             big.NewInt(0),
+		LondonBlock:             big.NewInt(0),
+		ArrowGlacierBlock:       big.NewInt(0),
+		MergeNetsplitBlock:      big.NewInt(0),
+		TerminalTotalDifficulty: big.NewInt(0),
+		ShanghaiTime:            big.NewInt(0),
+	},
 }
 
 // AvailableForks returns the set of defined fork names