bmon: Update scaffolding

packages/balance-monitor/.env.example

-CHAINID=
-L1_RPC_URL=
+export CHAINID=
+export L1_RPC_URL=
 
-SEQUENCER_ADDRESS=
-SEQUENCER_WARNING_THRESHOLD=
-SEQUENCER_DANGER_THRESHOLD=
+# Prepopulated with test values.
+export SEQUENCER_ADDRESS=0xabba
+export SEQUENCER_WARNING_THRESHOLD=1000
+export SEQUENCER_DANGER_THRESHOLD=100
 
-PROPOSER_ADDRESS=
-PROPOSER_WARNING_THRESHOLD=
-PROPOSER_DANGER_THRESHOLD=
+export PROPOSER_ADDRESS=0xacdc
+export PROPOSER_WARNING_THRESHOLD=2000
+export PROPOSER_DANGER_THRESHOLD=200
 

packages/balance-monitor/package.json

 {
-  "name": "minimum-balance-agent",
+  "name": "@eth-optimism/minimum-balance-agent",
   "version": "0.0.1",
   "description": "Forta Agent that reports whether certain accounts have fallen below some balance",
+  "homepage": "https://github.com/ethereum-optimism/optimism/tree/develop/packages/balance-monitor#readme",
+  "license": "MIT",
+  "author": "Optimism PBC",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/ethereum-optimism/optimism.git"
+  },
   "scripts": {
-    "build": "echo 'todo'",
+    "build": "tsc -p tsconfig.json",
+    "clean": "rimraf dist/ ./tsconfig.tsbuildinfo",
     "start": "yarn run start:dev",
     "start:dev": "nodemon --watch src --watch forta.config.json -e js,ts,json  --exec 'yarn run build && forta-agent run'",
     "start:prod": "forta-agent run --prod",
     "tx": "yarn run build && forta-agent run --tx",
     "block": "yarn run build && forta-agent run --block",
     "range": "yarn run build && forta-agent run --range",
-    "test": "echo 'todo'"
+    "test": "/bin/sh . .env.example && yarn ts-mocha src/*.spec.ts",
+    "test:coverage": "echo 'todo: configure test coverage' && yarn test",
+    "lint:check": "eslint . --max-warnings=0",
+    "lint:fix": "yarn lint:check --fix",
+    "lint": "yarn lint:fix && yarn lint:check"
   },
   "dependencies": {
     "ethers": "^5.7.2",
     "forta-agent": "^0.1.1"
   },
   "devDependencies": {
+    "@types/jest": "^26.0.23",
     "@types/nodemon": "^1.19.0",
+    "jest": "^27.0.6",
     "nodemon": "^2.0.8",
+    "ts-jest": "^27.0.3",
     "typescript": "^4.3.4"
   }
 }