Rln relay/membership contract (#359)

* updates test_waku_rln_relay

* adds contract's constructor input support

* adds contracts bytecodes

tests/v2/test_utils.nim

@@ -1,6 +1,17 @@
 import web3, chronos, options, stint
 
-proc deployContract*(web3: Web3, code: string, gasPrice = 0): Future[ReceiptObject] {.async.} =
+proc deployContract*(web3: Web3, code: string, gasPrice = 0, contractInput = ""): Future[ReceiptObject] {.async.} =
+  # the contract input is the encoded version of contract constructor's input
+  # use nim-web3/encoding.nim module to find the appropriate encoding procedure for different argument types
+  # e.g., consider the following contract constructor in solidity
+  # 	constructor(uint256 x, uint256 y) 
+  #
+  # the contractInput can be calculated as follows
+  # let
+  #   x = 1.u256
+  #   y = 5.u256
+  # contractInput = encode(x).data  &  encode(y).data 
+  # Note that the order of encoded inputs should match the order of the constructor inputs
   let provider = web3.provider
   let accounts = await provider.eth_accounts()
 
@@ -9,7 +20,7 @@ proc deployContract*(web3: Web3, code: string, gasPrice = 0): Future[ReceiptObje
     code = "0x" & code
   var tr: EthSend
   tr.source = web3.defaultAccount
-  tr.data = code
+  tr.data = code & contractInput
   tr.gas = Quantity(3000000000000).some
   if gasPrice != 0:
     tr.gasPrice = some(gasPrice)