Need to implement userlist privacy provider for higher versions of moodle > 3.6

[kristian-94]

1. provider_testcase::test_userdata_provider_implements_userlist with data set "logstore_caliper" ('logstore_caliper', 'logstore_caliper\privacy\provider')
   Failed asserting that false is true.

/siteroot/privacy/tests/provider_test.php:212
/siteroot/lib/phpunit/classes/advanced_testcase.php:80

To re-run:
vendor/bin/phpunit "provider_testcase" privacy/tests/provider_test.php