Add Custom scalar type

[EgorBarakhov]

Summary

Add type SquishedString useful for emails and personal info in forms

How it works

Test plan

List of steps to manually test introduced functionality:

• Open GraphiQL App
• Authenticate yourself
• Make request using schema:

  mutation {
  updateUser(input: {
  email: "  tony@stark.avenger    "
  firstName: "                Robert              "
  lastName : "        Downey      Jr.         "
  }) {
  me {
    email
    firstName
    lastName
  }
  }
  }

Review notes

While reviewing pull-request (especially when it's your pull-request), please make sure that:

• you understand what problem is solved by PR and how is it solved
• new tests are in place, no redundant tests
• DB schema changes reflect new migrations
• newly introduced DB fields have indexes and constraints
• there are no missed files (migrations, view templates)
• required ENV variables added and described in .env.example and added to Heroku
• associated Heroku review app works correctly with introduced changes

Deploy notes

N/A

References

• Resolves #191 Issue