Provide timestamp of first source project discovery

[Ly0n]

It might be interesting for many users of ecosyste.ms to know when an project has been discovery the first time. One example use case of this to determine when a project has been made public. The GitHub API does not provide such information and this value can differ significantly from the timestamp of the first commit, as many repositories are set to public with their first release.

For our use-case at ClimateTriage.com the project age is what we are looking for, but I still think I could be relevant for future use cases.

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[andrew]

For GitHub repositories, if there were not public initially, we can get the PublicEvent, from the timeline service for that repository: https://docs.github.com/en/rest/using-the-rest-api/github-event-types?apiVersion=2022-11-28#publicevent

Timeline api for list of public events: https://timeline.ecosyste.ms/api/v1/events?event_type=PublicEvent

One problem may be that the name of the repository may have changed since it was first made public, and the timeline indexes on name rather than uuid of the repository.