feat: implement HAR conversion

packages/hoppscotch-app/package.json

@@ -81,6 +81,7 @@
     "graphql-language-service-interface": "^2.9.1",
     "graphql-language-service-parser": "^1.10.4",
     "graphql-tag": "^2.12.6",
+    "httpsnippet": "^2.0.0",
     "io-ts": "^2.2.16",
     "json-loader": "^0.5.7",
     "lodash": "^4.17.21",
@@ -135,6 +136,8 @@
     "@types/codemirror": "^5.60.5",
     "@types/cookie": "^0.4.1",
     "@types/esprima": "^4.0.3",
+    "@types/har-format": "^1.2.8",
+    "@types/httpsnippet": "^1.23.1",
     "@types/lodash": "^4.14.177",
     "@types/splitpanes": "^2.2.1",
     "@types/uuid": "^8.3.3",