Issue #3483341 by mstrelan, smustgrave: Add array return type to all hook_schema implementations

core/.phpstan-baseline.php

core/lib/Drupal/Core/Database/database.api.php

core/modules/ban/ban.install

core/modules/comment/comment.install

core/modules/dblog/dblog.install

core/modules/file/file.install

core/modules/help/help.install

core/modules/history/history.install

core/modules/layout_builder/layout_builder.install

core/modules/locale/locale.install

core/modules/node/node.install

core/modules/search/search.install

core/modules/shortcut/shortcut.install

core/modules/system/system.install

.../system/tests/modules/database_test/database_test.install

...ules/system/tests/modules/entity_test/entity_test.install

...ules/system/tests/modules/module_test/module_test.install

...odules/system/tests/modules/pgsql_test/pgsql_test.install

...sts/modules/update_test_schema/update_test_schema.install

core/modules/user/user.install