Add webpack-bundle visualizer option

[CarolineDenis]

Fixed #2610

[maxpatiiuk]

The visualization looks super cool!
@specify/dev-testing @grantfitzsimmons I am going to merge this, but I encourage you to take a look at this as it's quite neat.

Really interesting that even though we use very few libraries, most of the bundle size is still comping from libraries (I added a red line around our code):

The giant purple block at the top is handsontable (workbench spreadsheet library)
The big pink block at the top is for xlsx parsing
Thus, half of all shipped code is just 2 WB libraries!
The green is the main bundle - get's loaded before any page is displayed. Half of it is comprised of libraries, other half of our code
And then the small bundles at the bottom right are lazy-loaded for individual components (i.e, Security Page, Tree Viewer, Wb Import)

[grantfitzsimmons]

That's so cool!

[specifysoftware]

This pull request has been mentioned on Specify Community Forum. There might be relevant details there:

https://discourse.specifysoftware.org/t/specify-7-8-8-release-announcement/1108/1