What's Changed

• Expand the Store interface by adding a GetLatestVersion method and make the interface public.
• Add a (non-blocking) method to check if there are pending migrations to the goose.Provider
  (#751):

func (p *Provider) HasPending(context.Context) (bool, error) {}

• The methods .Up, .UpByOne, and .UpTo from goose.Provider will invoke .HasPending before
  acquiring a lock with SessionLocker (if enabled). This addresses an edge case in
  Kubernetes-style deployments where newer pods with long-running migrations prevent older pods -
  which have all known migrations applied - from starting up due to an advisory lock. For more
  details, refer to #507 (comment) and #751.
• Move integration tests to ./internal/testing and make it a separate Go module. This will allow
  us to have a cleaner top-level go.mod file and avoid imports unrelated to the goose project. See
  integration/README.md
  for more details. This shouldn't affect users of the goose library.