Refactor fetching of remote resources (#11251)

app/helpers/jsonld_helper.rb

app/lib/request.rb

app/services/activitypub/fetch_remote_status_service.rb

app/services/fetch_link_card_service.rb

app/services/fetch_remote_account_service.rb

app/services/fetch_remote_status_service.rb

app/services/fetch_resource_service.rb

app/services/resolve_url_service.rb

app/workers/activitypub/delivery_worker.rb

spec/services/fetch_remote_account_service_spec.rb

spec/services/fetch_resource_service_spec.rb

spec/services/resolve_url_service_spec.rb