v0.27.0 - Interfaces and filters

What's Changed

• Fix issue with querying value on EmbedBlock by @JakubMastalerz in #399
• Fix circular import for PageInterface when using custom page interface by @mgax in #404
• Add an in_menu filter by @dopry in #402
• Add ability to specify the search operator by @dopry in #406
• Replace SnippetObjectType with SnippetInterface by @mgax in #405
  See https://wagtail-grapple.readthedocs.io/en/latest/general-usage/interfaces.html#snippetinterface for more details

Full Changelog: v0.26.0...v0.27.0