Polygon Migration Library Contracts (#795)

## Add new chain

Please fill the following form:

Provide the Chain ID (Only 1 chain id per PR).
- Chain_ID: 137

Provide RPC URL for the chain (should be able to query atleast 10
requests per minute for automatic PR check).
- RPC_URL: https://rpc.ankr.com/polygon

Relevant information:
Only adding the library contracts.

src/assets/v1.4.1/safe_migration.json

@@ -11,6 +11,7 @@
   "networkAddresses": {
     "1": "canonical",
     "56": "canonical",
+    "137": "canonical",
     "196": "canonical",
     "1101": "canonical",
     "1337": "canonical",

src/assets/v1.4.1/safe_to_l2_migration.json

@@ -11,6 +11,7 @@
   "networkAddresses": {
     "1": "canonical",
     "56": "canonical",
+    "137": "canonical",
     "196": "canonical",
     "1101": "canonical",
     "1337": "canonical",

src/assets/v1.4.1/safe_to_l2_setup.json

@@ -11,6 +11,7 @@
   "networkAddresses": {
     "1": "canonical",
     "56": "canonical",
+    "137": "canonical",
     "196": "canonical",
     "1101": "canonical",
     "1337": "canonical",