Additional Capabilities to Time Dimension graph

[royendo]

Is your feature request related to a problem? Please describe.
When viewing a time dimension graph, would like to have the ability to force values on the graph instead of mousing over options.

Describe the solution you'd like
command + click on a location would 'save' the location to on the graph then can roll over another value so two values displayed.

Could trigger the same % increase numbers as the period comparison feature

Additional context
FR from Angel
https://rilldata.slack.com/archives/C07KSF2DPPV/p1725673450826209