Feature Request: [UI] Minify query button

[traumschule]

This issue pertains to the following package(s):

• GraphQL Playground - Electron App
• GraphQL Playground HTML
• GraphQL Playground

What is the expected behavior?

UI already has a Prettify button to expand a query with proper whitespaces for readability.

The Minify button strips all non-essential whitespaces while keeping the query intact.

This saves space when pasting and sharing queries.

What is the actual behavior?

Not implemented.