[RelativeCI] Allow drill down info for assets and other visualizations

[jflayhart]

It would be really nice to drilldown into WHAT (and even where) the offending asset(s) are with things like file size and file name, etc:

Then to understand WHY it might be helpful to get more insight integrating a tool like webpack-bundle-analyzer into this GUI.

Just want a more wholesome look at what is wrong and "why" to help understand how to fix a large bundle.

[vio]

Thanks @jflayhart! I think this issues are related:

1. UI: Add navigation between sections bundle-stats#594
2. UI - treemap charts bundle-stats#623
3. UI: Packages - tree map graph bundle-stats#622

[vio]

FYI, all the section links are done(rel relative-ci/bundle-stats#594):

Summary metric item - navigate to the corresponding view
Bundle size -> Totals tab
Initial JS size -> Assets tab - entries filtered by type JS and asset type initial
Initial CSS size -> Assets tab - entries filtered by type CSS and asset type initial
Cache invalidation -> Assets tab - entries filtered by changed flag
Asset count -> Assets tab - all entries
Chunk count -> Assets tab - all chunk entries
Modules -> Modules tab
Packages -> Packages tab - all packages
Duplicate packages -> Packages tab - packages filtered by duplicate flag
Duplicate package -> Packages tab - entries filtered by package name
Totals by type chart -> Assets tab - entries filtered by type -> #1212
Totals by type table -> Assets tab - entries filtered by type
Assets -> Modules tab - chunk view -> #1210
Packages -> Modules tab - entries filtered by package -> #1211

will consider this done for now, but feel free to open another issue if you are considering a specific case