[Feature Request] generate metrics in check mode

[gnalsa]

We have the use case to generate metrics from running check mode against our environment. For example collecting the following metrics from a check mode run:

• ansible.check_mode.ok
• ansible.check_mode.changed
• ansible.check_mode.failures
• ansible.check_mode.changed
• ansible.check_mode.skipped
• ansible.check_mode.unreachable

This would help identify unexpected changes at a high level prior to running a playbook in normal mode.