Feat/nightingale tooltip

[justintyf01]

I am using this nightingale library for antibody sequence visualisation and it was missing a tooltip component. I have implemented this component, feel free to use it if deemed useful.

• Edited Feature type to include "description" and "evidence" instead of "tooltipContent".
• Main CSS styling for tooltip is in nightingale-tooltip
• Implemented a handleTrackClick in nightingale-manager that is called by the existing "change" event listener when a track is clicked
• Implemented new document event listener to handle closing of tooltip and de-highlighting when user clicks elsewhere on the screen

Thank you.

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[gustavo-salazar]

Dear @justintyf01 Thank you so much for opening this PR, and sorry for taking this long to reply. And yeah, a tooltip is something other users have requested. So, I'll happily include a component that offers that into Nightingale. I will check this PR soon but I'll ask you 2 things before:

1. The formatting on your side uses 4 spaces, and maybe other options that are making the read of your changes a harder than needed. I have run npm run format on main, so please do the same on your branch, after merging the latest changes from main. Hopefully. this will make the PR to only show the important changes.
2. Please create a story in /stories so we can see an example of the tooltip in the demo app.