Allow PUB (package manager) to be imported by other applications.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/713530?v=3" align="left" width="96" height="96"hspace="10"> Issue by chrisbu
Originally opened as dart-lang/sdk#2435

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What steps will reproduce the problem?
Per the comment on Bob N's proposal document for pub, it would be able to "pub serve" files to dartium, which would allow translation of the url's through a "magic" function.

It would be useful for other applications to be able to #import pub itself and be able to call that magic function to translate any #import references on the fly (rather than having them served directly by pub).

Please provide any additional information below.

proposal document link:
https://docs.google.com/document/d/13y7yCwq9GtPChXtd6t0YMcUtMJLZq2IVwq546Dve_No/edit?disco=AAAAAEgzOT4

[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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Added Area-Pub, Triaged labels.

[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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I think having a programmatic interface to pub is on our radar, but not near-term.

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Added this to the Later milestone.

[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 Type-Defect label.
Added Type-Enhancement label.

[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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Issue #498 has been merged into this issue.

[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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I'm going to close this out because we don't have concrete use cases for a pub API yet. When/if we do, it will make more sense to file bugs then for the actual API we want to support.

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Added NotPlanned label.