Adds web3 (#316)

* adds web3

* adds comment

* Revert "adds comment"

This reverts commit dbe59e7e49.

* adds comments

.gitmodules

@@ -103,3 +103,6 @@
 	url = https://github.com/arnetheduck/nim-sqlite3-abi.git
 	ignore = dirty
 	branch = master
+[submodule "vendor/nim-web3"]
+	path = vendor/nim-web3
+	url = https://github.com/status-im/nim-web3.git

tests/all_tests_v2.nim

@@ -10,4 +10,5 @@ import
   ./v2/test_rpc_waku,
   ./v2/test_waku_swap,
   ./v2/test_message_store,
-  ./v2/test_jsonrpc_waku
+  ./v2/test_jsonrpc_waku,
+  ./v2/test_web3 # will remove it when rln-relay tests get added

tests/v2/test_web3.nim

@@ -0,0 +1,5 @@
+import web3
+proc web3Test() =
+  var web3: Web3 # an identifier from web3 package
+
+web3Test()

vendor/nim-web3

@@ -0,0 +1 @@
+Subproject commit dde382f70e811d964a000bdd4d86151615f9d4c0

waku.nimble

@@ -20,7 +20,8 @@ requires "nim >= 1.2.0",
   "stew",
   "stint",
   "metrics",
-  "libp2p" # Only for Waku v2
+  "libp2p", # Only for Waku v2
+  "web3"
 
 ### Helper functions
 proc buildBinary(name: string, srcDir = "./", params = "", lang = "c") =