Revert "Issue #1906810 by dawehner, damiankloip, tstoeckler, kgoel, fubhy, jrglasgow, xjm, Gaelan, socketwench: Require type hints for automatic entity upcasting."

This reverts commit c9e73f7d.

Issue #1906810 by dawehner, damiankloip, tstoeckler, kgoel, fubhy, jrglasgow, xjm, Gaelan, socketwench: Require type hints for automatic entity upcasting.

Issue #2063401 by dawehner, damiankloip, tim.plunkett: Replace the default _access_checks()(access mode) with ALL instead of ANY.

Issue #2087231 by tim.plunkett, pwolanin: Add a PluginBase in the Core namespace with t() as a helper method.

Issue #2051097 by dawehner, Manuel Garcia, tlattimore, neclimdul: Change 'pattern' to 'path' in *.routing.yml files.

Issue #2011122 by hussainweb, kgoel, chrisjlee: Replace drupal_container() with injected services in the rest module.

Issue #1986802 by yched: Rename PluginInspectionInterface::getDefinition() to getPluginDefinition().