Add ci field: show how many installs were from a CI

[hugovk]

Re: pypi/linehaul-cloud-function#9

It'll take time for BigQuery to populate some more, but we can now see what proportion of downloads are from a CI.

❯ pypinfo --percent --days 5 pillow ci
Served from cache: False
Data processed: 384.22 MiB
Data billed: 385.00 MiB
Estimated cost: $0.01

| ci    | percent | download_count |
| ----- | ------- | -------------- |
| None  |  79.37% |     11,963,127 |
| True  |  20.63% |      3,109,931 |
| Total |         |     15,073,058 |

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (7a1c53c) to head (3ed92eb).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #157   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          546       547    +1     
  Branches        74        74           
=========================================
+ Hits           546       547    +1     

Flag	Coverage Δ
macOS-latest	100.00% <100.00%> (ø)
ubuntu-latest	100.00% <100.00%> (ø)
windows-latest	100.00% <100.00%> (ø)

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[ofek]

It's awesome that this is possible now! After CI passes this looks good to me.