Add systemd role for restarting multiple services in same transaction

roles/systemd/README.md

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+Adds systemd-related notifiable handlers
+
+- Reload systemd daemon
+  - Reloads all systemd unit files
+- Apply systemd unit restarts
+  - Restarts multiple systemd units in a single transaction
+  - Units to be restarted are defined in the `systemd_restart_units` variable of type list
+  - The variable should be set using `ansible.builtin.set_fact`
+  - The list must not be overridden, but appended (`systemd_restart_units: "{{ systemd_restart_units + ['restartme.service'] }}"`

roles/systemd/defaults/main.yaml

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+---
+systemd_restart_units: []

roles/systemd/handlers/main.yaml

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+---
+- name: Reload systemd daemon
+  ansible.builtin.systemd_service:
+    daemon_reload: true
+
+- name: Apply systemd unit restarts # noqa: command-instead-of-module
+  ansible.builtin.command:
+    cmd: systemctl restart {{ systemd_restart_units | join(' ') }}
+  changed_when: true
+
+- name: Reset systemd restart units
+  listen: Apply systemd units restart
+  ansible.builtin.set_fact:
+    systemd_restart_units: []