APIv4 - Add filter for entity tags

CRM/Core/BAO/EntityTag.php

CRM/Core/DAO/EntityTag.php

CRM/Core/PseudoConstant.php

CRM/Upgrade/Incremental/sql/5.40.alpha1.mysql.tpl

Civi/Api4/Query/Api4SelectQuery.php

Civi/Api4/Service/Spec/Provider/ContactGetSpecProvider.php

...pi4/Service/Spec/Provider/EntityTagFilterSpecProvider.php

api/v3/utils.php

tests/phpunit/api/v4/Action/FkJoinTest.php

tests/phpunit/api/v4/Action/GetExtraFieldsTest.php

tests/phpunit/api/v4/Entity/TagTest.php

xml/schema/Core/EntityTag.xml

xml/templates/civicrm_data.tpl