EIP-1186 eth_getProof (#17737)

* first impl of eth_getProof

* fixed docu

* added comments and refactored based on comments from holiman

* created structs

* handle errors correctly

* change Value to *hexutil.Big in order to have the same output as parity

* use ProofList as return type

core/vm/interface.go

@@ -35,6 +35,8 @@ type StateDB interface {
 	SetNonce(common.Address, uint64)
 
 	GetCodeHash(common.Address) common.Hash
+	GetProof(common.Address) (ProofList, error)
+	GetStorageProof(common.Address, common.Hash) (ProofList, error)
 	GetCode(common.Address) []byte
 	SetCode(common.Address, []byte)
 	GetCodeSize(common.Address) int
@@ -78,3 +80,11 @@ type CallContext interface {
 	// Create a new contract
 	Create(env *EVM, me ContractRef, data []byte, gas, value *big.Int) ([]byte, common.Address, error)
 }
+
+// MerkleProof
+type ProofList [][]byte
+
+func (n *ProofList) Put(key []byte, value []byte) error {
+	*n = append(*n, value)
+	return nil
+}