Issue #3276561: Add support for the Menu Item Extras module

Closes #3276561. It takes patch #11 and adds caching to the getRouteResourceTypes() method, as that was causing issues on sites with a large number of menus.

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• ea7be05d...b4a34776 - 2 commits from branch project:1.2.x
• 930f3caa - Merge branch jsonapi_menu_items:1.2.x into 3276561-support-menu-item-extras

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Some initial thoughts. There also are no tests.

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• fe25591e - add menu_link_config and menu_item_extras to require-dev
• d67c51c7 - refactor getRouteResourceTypes and test

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• abd72342 - use the same cache tags as resource type repository
• 6511a240 - flag accessCheck

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• e07b2e04 - test resource objects returned

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• 65dc9715 - fix resource type determination

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• b7376188 - test attribute output

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• d792910c - normalize adding fields

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resolved all threads

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• 208b0092 - phpcs

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• 481abae9 - handle MenuLinkContent::getEntity visibility in previous versions

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resolved all threads

merged