Issue #2429257 by Wim Leers, Fabianx, effulgentsia: Bubble cache contexts

core/lib/Drupal/Core/Cache/Cache.php

core/lib/Drupal/Core/Cache/CacheContexts.php

core/lib/Drupal/Core/Entity/EntityViewBuilder.php

...e/Field/Plugin/Field/FieldFormatter/LanguageFormatter.php

.../Field/Plugin/Field/FieldFormatter/TimestampFormatter.php

core/lib/Drupal/Core/Render/BubbleableMetadata.php

core/lib/Drupal/Core/Render/Renderer.php

core/lib/Drupal/Core/Render/RendererInterface.php

...c/Plugin/Field/FieldFormatter/CommentDefaultFormatter.php

.../Plugin/Field/FieldFormatter/DateTimeDefaultFormatter.php

...rc/Plugin/Field/FieldFormatter/DateTimePlainFormatter.php

core/modules/filter/src/FilterProcessResult.php

core/modules/filter/src/Tests/FilterAPITest.php

...filter_test/src/Plugin/Filter/FilterTestCacheContexts.php

core/modules/node/src/Tests/NodeCacheTagsTest.php

...dules/system/src/Tests/Entity/EntityCacheTagsTestBase.php

...ystem/src/Tests/Entity/EntityWithUriCacheTagsTestBase.php

.../src/Plugin/Field/FieldFormatter/TextDefaultFormatter.php

.../src/Plugin/Field/FieldFormatter/TextTrimmedFormatter.php

core/tests/Drupal/Tests/Core/Cache/CacheContextsTest.php