* Chore: Move and wrap Cascader component to @grafana/ui
Closes#19042
* Removes unneeded props from interface and removes rc-trigger
* Removes more unneeded props
- load all histogrammable metrics on start, based on `{le!=''}` series
query
- select dropdown shows all those metrics as well as histograms in a
special group
- select a metric will write fill the metric in the query box
- if a histogram is chosen, it will write a complete
`histogram_quantile` query
- added new dependency: rc-cascader
