Feature Request: variables for panel options

### Discussed in https://github.com/grafana/grafana/discussions/55008 <div type='discussions-op-text'> ^{Originally posted by **jufy111** September 10, 2022} It would be great to be able to use variables for the panel options. For example, in a dashboard full of timeseries graphs, being able to assign a variable as the "axis width" or "legend width" would make it easy to adjust the width of the legend or axis for all panels in the dashboard by simply changing the variable. This would also add the functionality of being able to hide the code for all meetings by simply setting the width to zero. </div>