port graphiql_explorer_operation_action_menu_items from core plugin

[josephfusco]

User Story

As a WordPress developer, I would like to be able to actions/filter various parts of the GraphiQL IDE to provide customized functionality.

Acceptance Criteria

• new action/filter names is prefixed with wpgraphqlide_
• existing functionality of action/filter is honored
• ported action/filter is documented

Reference

• Core plugin
• Existing documentation

Note that this one is unlikely to be ported over given the context of the current core implementation.

Confirm that this is not needed.

[jasonbahl]

The legacy IDE had "action menu items" in the Query Composer on each "document" in the IDE.

These menu items were filterable.

We've intentionally decided to leave this menu out of the UI so this filter will not be ported to the new WPGraphQL IDE.

Possibly could be revisited in the future as the new Query Composer gets some iteration, but no immediate plans to support this "action menu" on each operation in the query composer.

[josephfusco]

Closing in favor of #109