extract psbt module from caravan-bitcoin

packages/caravan-psbt/jest.config.js

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+module.exports = {
+  preset: "ts-jest",
+  testEnvironment: "node"
+};

packages/caravan-psbt/package.json

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+{
+  "name": "@caravan/psbt",
+  "version": "0.0.0-beta",
+  "description": "typescript library for working with PSBTs",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "module": "./dist/index.mjs",
+  "engines": {
+    "node": ">=16"
+  },
+  "scripts": {
+    "build": "tsup src/index.ts --format cjs,esm --dts",
+    "dev": "npm run build -- --watch",
+    "test": "jest src",
+    "test:watch": "jest --watch src",
+    "test:debug": "node --inspect-brk ../../node_modules/.bin/jest --runInBand"
+  },
+  "keywords": [
+    "bitcoin",
+    "psbt"
+  ],
+  "dependencies": {
+    "@caravan/bitcoin": "*",
+    "bignumber.js": "^8.1.1",
+    "bitcoinjs-lib": "^5.1.10",
+    "buffer": "^6.0.3",
+    "bufio": "^1.2.1",
+    "esbuild-plugin-polyfill-node": "^0.3.0"
+  },
+  "author": "unchained capital",
+  "license": "ISC",
+  "devDependencies": {
+    "@types/jest": "^29.5.8",
+    "jest": "^29.4.1",
+    "ts-jest": "^29.1.1",
+    "tsup": "^7.2.0",
+    "typescript": "^5.2.2"
+  }
+}

packages/caravan-psbt/src/index.ts

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+export { PsbtV2, getPsbtVersionNumber } from './psbtv2';
+