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Introduce virtual tasks - task manager tasks which cover cluster-wide operations. Virtual tasks aren't kept in memory, instead their statuses are retrieved from associated service when user requests them with task manager API. From API users' perspective, virtual tasks behave similarly to regular tasks, but they can be queried from any node in a cluster. Virtual tasks cannot have a parent task. They can have children on each node in a cluster, but do not keep references to them. So, if a direct child of a virtual task is unregistered from task manager, it will no longer be shown in parent's children vector. virtual_task class corresponds to all virtual tasks in one group. If users want to list all tasks in a module, a virtual_task returns all recent supported operations; if they request virtual task's status - info about the one specified operation is presented. Time to live, number of tracked operations etc. depend on the implementation of individual virtual_task. All virtual_tasks are kept only on shard 0. Refs: https://github.com/scylladb/scylladb/issues/15852 New feature, no backport needed. Closes scylladb/scylladb#16374 * github.com:scylladb/scylladb: docs: describe virtual tasks db: node_ops: filter topology request entries test: add a topology suite for testing tasks node_ops: service: create streaming tasks node_ops: register node_ops_virtual_task in task manager service: node_ops: keep node ops module in storage service node_ops: implement node_ops_virtual_task methods db: service: modify methods to get topology_requests data db: service: add request type column to topology_requests node_ops: add task manager module and node_ops_virtual_task tasks: api: add virtual task support to get_task_status_recursively tasks: api: add virtual task support tasks: api: add virtual tasks support to get_tasks tasks: add task_handler to hide task and virtual_task differences from user tasks: modify invoke_on_task tasks: implement task_manager::virtual_task::impl::get_children tasks: keep virtual tasks in task manager tasks: introduce task_manager::virtual_task