fix: Unify both executor addresses in one file

- Move executor_addresses.json to a top level directory
- Delete executors.json
- Use the same file for both encoding and setting executors

--- don't change below this line ---
ENG-4260 Took 19 minutes


Took 11 seconds

config/executor_addresses.json

@@ -0,0 +1,8 @@
+{
+  "ethereum": {
+    "uniswap_v2": "0x00C1b81e3C8f6347E69e2DDb90454798A6Be975E",
+    "uniswap_v3": "0x5C2F5a71f67c01775180ADc06909288B4C329308",
+    "uniswap_v4": "0xF62849F9A0B5Bf2913b396098F7c7019b51A820a",
+    "vm:balancer_v2": "0x543778987b293C7E8Cf0722BB2e935ba6f4068D4"
+  }
+}