New `membership_kind` argument on `workspaces`

You can now filter workspaces by the type of membership relationship the user has with each workspace using the new membership_kind argument.

Use all to return all workspaces the user has access to, or member to return only the workspaces the user is explicitly a member of.

query {
  workspaces(membership_kind: member) {
    id
    name
    kind
    description
  }
}