feat: replace lerna with pnpm

Author: AlexKushnir1

.gitignore

@@ -3,7 +3,5 @@ node_modules/
 .near-credentials/
 coverage
 **/dist/tsconfig.tsbuildinfo
-lerna-debug.log
-yarn-error.log
 .idea
 package-lock.json

.yarnrc

@@ -17,7 +17,7 @@
     "test:sandbox:ci-with-ignore": "pnpm build && ava __tests__/0* && cd examples/simple-project/ && ava && cd ../../packages/js && ava",
     "test": "pnpm test:sandbox && pnpm test:testnet",
     "prepare": "husky install",
-    "release": "pnpm lerna publish",
+    "release": "pnpm publish",
     "release:prerelease": "pnpm release --dist-tag next",
     "docs:generate": "typedoc"
   },
@@ -29,7 +29,6 @@
     "@types/rimraf": "^3.0.1",
     "ava": "^4.0.1",
     "husky": "^7.0.1",
-    "lerna": "^5.2.0",
     "ts-node": "^10.9.1",
     "typedoc": "^0.24",
     "typescript": "^4.7.4",