Move SharedArrays to a package

[JeffBezanson]

Nothing in Base depends on this, it's pretty self-contained and should be easy to move.

Part of #5155.

[tknopp]

@JeffBezanson: Great that you are pushing this. To make the transition smoothly it would IMHO be great to have 5-10 metapackages that just reexport a larger set of packages. Think about this as "toolboxes" in Matlab. For instance a "Parallel.jl" package could be the home for all parallel computing stuff (i.e. Shared Arrays) If you promote these metapackages people will not have issues discovering them. We could even have in Julia a function

list_recomended_metapackages()

My proposal in #5155 was to install them by default but nowadays I am not sure if this is really required.

[ChrisRackauckas]

If you promote these metapackages people will not have issues discovering them. We could even have in Julia a function

I think it would be better if this was just formalized as part of the package system. I.e. there are packages and metapackages (or toolboxes). If we end up doing a "curated METADATA" like people have been suggesting, then the recommended metapckages could just be those in the curated METADATA.

[KristofferC]

Was at least moved to stdlib in #23931

[ararslan]

Let's keep this open to remember to move it out of the repo entirely. Though not urgent.

[ViralBShah]

Seems like we should be able to close this, since we have a whole bunch of such things in stdlib.

[StefanKarpinski]

Yes, shared arrays is already in stdlib so this seems to be done. Is there anything else to do?