[Bullet] Show current value

[ghudgins]

Is your feature request related to a problem? Please describe. Cannot see the current value of a goal "at a glance" in the bullet chart

Describe the solution you'd like Deliver an option to display the value of the metric

Describe alternatives you've considered There is no workaround today

Checklist

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• [x] this request is checked against already exist requests
• [x] every related Kibana issue is listed under Kibana Cross Issues list
• [x] kibana cross issue tag is associated to the issue if any kibana cross issue is present