feat: disable introspection except for root key

[coratgerl]

Currently, we disable introspection for the GraphQL schema for all requests. However, we should only authorize the root key to make this query. This will be useful for the integrated Dashboard.

Here is the location of this code in Wabe: link.

Here is an example of the documentation that we should use:

const yoga = createYoga({
  graphiql: false,
  plugins: [
    useDisableIntrospection({
      isDisabled: request => request.headers.get('x-allow-introspection') !== 'secret-access-key'
    })
  ]
});

Documentation : https://the-guild.dev/graphql/yoga-server/docs/features/introspection

This feature should be covered with a test in this file : https://github.com/palixir/wabe/blob/main/packages/wabe/src/server/index.test.ts

[Haroldwonder]

I want to work on this.