Supply stats for pub authors

[DartBot]

<img src="https://avatars.githubusercontent.com/u/5479?v=3" align="left" width="96" height="96"hspace="10"> Issue by sethladd
Originally opened as dart-lang/sdk#5424

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A pub author will be interested in their own stats for their pub packages.

Some stats would include:

* Page views

• Downloads (per version)
• Updates (if we track those differently from initial downloads)

Ideally, pub can allow a pub author to supply their own Google Analytics code for their specific page.

Note on implementation: if we stored all the binaries in google cloud storage, it'd be easy to move the logs into bigquery for analysis. Bonus: we could also use prediction api to offer recommendations for users (users who installed library A also installed library B)

[DartBot]

<img src="https://avatars.githubusercontent.com/u/148256?v=3" align="left" width="48" height="48"hspace="10"> Comment by kaisellgren

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I'd be interested in seeing who have made most packages, and what packages a specific author has made.

NPM has a nice repository: https://npmjs.org/

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Removed Area-Pub label.
Added Area-PubSite label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/17034?v=3" align="left" width="48" height="48"hspace="10"> Comment by kevmoo

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Issue dart-lang/sdk#18178 has been merged into this issue.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2156198?v=3" align="left" width="48" height="48"hspace="10"> Comment by kasperl

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Removed this from the Later milestone.
Added Oldschool-Milestone-Later label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2156198?v=3" align="left" width="48" height="48"hspace="10"> Comment by kasperl

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Removed Oldschool-Milestone-Later label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/3766663?v=3" align="left" width="48" height="48"hspace="10"> Comment by nicolasgarnier

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This issue has been moved to Github as part of a migration. Please use the Issue on Github going forward: https://github.com/dart-lang/pub-dartlang/issues

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Added MovedToGithub label.