refactor: remove `lodash`

[0ss]

Context

I have noticed that lodash is being used in the client and it's making the client unnecessarily heavy because of it's size

so I removed in index.js all the code that uses lodash and it's functions and replaced it with normal JavaScript to exclude lodash.

• I replaced merge with object spread {...}
• I replaced pick with ES6 destructuring assignment

💡 I haven't removed lodash from dependencies because the test files still use it

[TimonKK]

Could you remove lodash from package.json?