Add type to jest matcher

[ndowmon]

Added

• Updated jest matchers in the following way:

  • added optional _type argument to .toMatchGraphObjectSchema matcher
  • added optional _type and _class arguments to
    .toMatchDirectRelationshipSchema matcher

  This enables developers to simply pass the StepEntityMetadata and
  StepRelationshipMetadata interfaces to these matchers. Usage:

  expect(collectedEntities).toMatchGraphObjectSchema(Entities.USER);
  expect(collectedRelationships).toMatchDirectRelationshipSchema(
    Relationships.ACCOUNT_HAS_USER,
  );

[ndowmon]

Fixes #613 and #614