[BE] Config: New graphql query to surface all permissions, resources and boundaries needed for fine-grained PATs creation

We need a query to fetch all available fine-grained PAT permissions so that they can be shown to the user as selectable permissions in the UI. Refer to this permissions spreadsheet.

Proposed query:

query {
  personalAccessTokenPermissions {
    category
    resource
    value
    type
    boundaries
}

Example response:

{
  personalAccessTokenPermissions: [
    {
      category: 'Administration',
      resource: 'Access Tokens',
      value: 'READ_ACCESS_TOKENS',
      type: 'READ',
      boundaries: ['PROJECT', 'GROUP']
    },
    {
      category: 'Tokens',
      resource: 'User Tokens',
      value: 'ADMIN_USER_TOKENS',
      type: 'ADMIN',
      boundaries: ['USER']
    },
  ]
}

Field name	Possible values	Description
category	Category name	Category of the permission
resource	Resource name	Resource name of the permission
value	Value enum	Value name of the permission
type	READ, CREATE, UPDATE, DESTROY, ADMIN	Verb for what the permission does. Only one value.
boundaries	USER, PROJECT, GROUP, ADMIN	Which boundaries the permission applies to. Can be multiple values.

Please do not page this collection with a connection, it should return the entire list in one query.