feat: remove lodash as a dependency (#2378)

This will reduce the bundle size by ~23%(117kb).

Only 4 methods were used `flatten`, `flatMap`, `omitBy`, and `groupBy`.

`omitBy and `groupBy` were recreated while the es2019 implementations of
`flatten` and `flatMap` are used.

`lodash` is still used in the tests which is fine because it makes the
tests cleaner.

Closes #2118

tsconfig.json

@@ -2,6 +2,7 @@
   "compilerOptions": {
     "composite": true,
     "module": "commonjs",
+    "lib": ["es2019", "dom"],
     "moduleResolution": "node",
     "esModuleInterop": true,
     "sourceMap": true,