service: tasks: extend virtual_task_hint

Extend virtual_task_hint to contain task_type and tablet_id. These
fields would be used by tablet_virtual_task in the following patches.

service/task_manager_module.hh

@@ -13,6 +13,7 @@
 
 namespace locator {
 class tablet_id;
+enum class tablet_task_type;
 }
 
 namespace service {

tasks/task_manager.cc

@@ -795,4 +795,18 @@ future<> task_manager::uninit_ms_handlers() {
     return make_ready_future();
 }
 
+locator::tablet_task_type virtual_task_hint::get_task_type() const {
+    if (!task_type.has_value()) {
+        on_internal_error(tmlogger, "tablet_virtual_task hint does not contain task type");
+    }
+    return task_type.value();
+}
+
+locator::tablet_id virtual_task_hint::get_tablet_id() const {
+    if (!tablet_id.has_value()) {
+        on_internal_error(tmlogger, "tablet_virtual_task hint does not contain tablet_id");
+    }
+    return tablet_id.value();
+}
+
 }

tasks/virtual_task_hint.hh

@@ -8,12 +8,18 @@
 
 #pragma once
 
+#include "locator/tablets.hh"
 #include "schema/schema_fwd.hh"
 namespace tasks {
 
 struct virtual_task_hint {
     // Contains hints for all virtual tasks types.
     std::optional<table_id> table_id;
+    std::optional<locator::tablet_task_type> task_type;
+    std::optional<locator::tablet_id> tablet_id;
+
+    locator::tablet_task_type get_task_type() const;
+    locator::tablet_id get_tablet_id() const;
 };
 
 }