Allow the zoom arc-brush more flexibility

[emersonlebleu]

• Turn it into a true wedge
• Don't zoom automatically
• Overlay a zoom button (more buttons will be available later overlay sample-coverage)

[emersonlebleu]

• Allow it to be dragged & resized as well

[emersonlebleu]

Allow the user to inspect the genes in the section. Similar to how variants can lookup genes and their associations.

[emersonlebleu]

We will likely be removing this chart as it adds complexity that doesn't seem to add additional functionality.