core/vm: Rename SHA3 instruction to KECCAK256 (#23976)

This was proposed in 2016, Solidity uses this since 2017, and evmone and other VMs use the keccak256 name. This brings geth in line with those.

core/vm/memory_table.go

@@ -16,7 +16,7 @@
 
 package vm
 
-func memorySha3(stack *Stack) (uint64, bool) {
+func memoryKeccak256(stack *Stack) (uint64, bool) {
 	return calcMemSize64(stack.Back(0), stack.Back(1))
 }