Expose glean as a library

[tarikeshaq]

This is for adding glean as an exposed library to our rust-components-swift. The change is very simple, it basically does what https://github.com/mozilla/glean-swift does and is meant to replace it for consumers, so we can ensure there is only one version of glean our consumers get

There is still one part missing from this change that I'll add, and that's the scripts. in glean-swift there is a useful script that updates the version, computes the checksum and creates a tag, we have a script ourselves that does similar things (minus the upgrading the version and computing the checksum, but it can very well do so)

I am very open to feedback here, and if there are any other ways to do this (expose Glean) or other suggestions to make this easier, I'll happily take them!

cc: @badboy , this won't merge yet, I'll get to the scripts on my Tuesday (Monday is a Canadian Holiday!) but cc'ing you in case you have any thoughts or opinions on the general direction

[badboy]

What's the plan on updating this in the future?
Right now we automate this on a glean release to push an update to glean-swift. Should we then move that over to this repo?

[tarikeshaq]

Hmm yeah, this raises a question related to https://github.com/mozilla/rust-components-swift/issues/10, we should decide what versioning looks like on this repository given that it will no longer hold just application services packages @skhamis and I were thinking the versions should reflect the AS versions, but that wouldn't make sense if we have glean in there too

[skhamis]

Hmm this definitely raises some good questions I wonder if maybe we should have more discussions with stakeholders the best approach to this before exposing it as a target in this library. Since there are other consumers of glean I wonder if you just want glean we leave it as an option via glean-swift and if you want to use Nimbus you use A-S (which comes with glean). Definitely not ideal but happy to continue the discussion in an issue

[skhamis]

I think we can safely close this now -- but i'll leave it to you!