Base deployment to v1 (#235)

## Description

The code in this PR is the result of checking out the v1 branch (based
on current v1.6.0) and running `git cherry-pick
f3a13f8`.

We're creating the new v1 branch to make it easier to organize the
minimal changes required to support the Base network on top of v1.6.0.
This is made necessary by the fact that the recent changes have stripped
this repo of most of the JS libraries provided by the NPM package.

Eventually, we plan to deprecate all the JS libraries provided by this
repo and only include contract/Foundry code.

Co-authored-by: m-lord-renkse <[email protected]>

Author: fedgiac

balancer/networks.json

@@ -23,6 +23,10 @@
     "42161": {
       "address": "0xA331D84eC860Bf466b4CdCcFb4aC09a1B43F3aE6",
       "transactionHash": "0x7b3fcae6346e179585d978bd668f9ba3f38c1473539b7c5b882ec0840abcc053"
+    },
+    "8453": {
+      "address": "0xA331D84eC860Bf466b4CdCcFb4aC09a1B43F3aE6",
+      "transactionHash": "0xd84761268b0e127b1490a65f9a2f77937fec951bd0cb637850953a7058ed7ab9"
     }
   },
   "Vault": {
@@ -49,6 +53,10 @@
     "42161": {
       "address": "0xBA12222222228d8Ba445958a75a0704d566BF2C8",
       "transactionHash": "0xe2c3826bd7b15ef8d338038769fe6140a44f1957a36b0f27ab321ab6c68d5a8e"
+    },
+    "8453": {
+      "address": "0xBA12222222228d8Ba445958a75a0704d566BF2C8",
+      "transactionHash": "0x0dc2e3d436424f2f038774805116896d31828c0bf3795a6901337bdec4e0dff6"
     }
   }
 }

deployments/base/.chainId

@@ -0,0 +1 @@
+8453