[Lens] Ability to clone a metric in the lens configurator

[AlonaNadler]

Describe the feature:
occasionally users want to show another metric using either the same field with a different function or the same function with a different field. The ability to clone a metric in the Lens configurator will simplify users flow and allow them to include a similar variation without the need to go to the left side field list, search for the field again, and drag it to the preview or across the screen to the configurator
For example:

• chart that shows min(bytes) and another series max(bytes)
• chart that has a series for the median duration and another series for an average duration

Suggestion: quickly allow to clone a metric from the Lent configurator so users can change the metric

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[flash1293]

@AlonaNadler We considered something similar as part of the drag/drop extensions, but decided to move it after the "Lens by default" features (see a mockup in this comment: #51739 (comment) ) Do you think drag/drop would be a good UI for this?

[flash1293]

This is possible now