[Investigation] Update bundle tab summary

[nicholas-codecov]

With our changes bringing in better gzip data inside our stats, we should update our bundle tab summary a bit to give a better value to the end user. The reason being is that you can't compress every file type with gzip and the two primary things we care about splitting out that are compressible are JS and CSS as they are the most actionable by developers without going outside of their editor. Also we're looking at removing the module count, as it really doesn't affect things in the bundle, as the bundler abstracts and combines the modules into assets so it doesn't really matter how many their are

Below is the proposed solution. Breaking out JS and CSS stats specifically, and grouping together the remainder, while removing the module count.

WIP: designs

[codecovdesign]

from slack thread (7/9):

• 1562 has relationship to this in that the summary data may change TBD from resulting filtering by user (type: js, css, etc)

• gzip data changes support update since not every file compressed will appear in summary data
  • JS and CSS show it, but not other - is that because other may not have clear data? if not, for the data to js/css is this accurate even if some file are not compressed

added WIP: designs per the breakdown update in description

[nicholas-codecov]

is that because other may not have clear data? if not, for the data to js/css is this accurate even if some file are not compressed

The current way we display gzip data is incorrect (in a big way) and we will be removing it so we do not confuse users. JS and CSS the data will be accurate because we are actually running gzip on the files and getting the resulting size.