\Drupal\views\Plugin\views\argument\ArgumentPluginBase should allow subplugins to specify a more specific url cache context

Problem/Motivation

From #2501905-2: \Drupal\views\Plugin\views\argument_default\QueryParameter should specify a more specific cache context → :

  public function getCacheContexts() {
    $contexts = [];
    // By definition arguments depends on the URL.
    // @todo Once contexts are properly injected into block views we could pull
    //   the information from there.
    $contexts[] = 'url';

Currently, adding an argument to a view makes the view cacheable per url even if the argument value depends only on a single query argument value.

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes