Automatic pack namespace support

[stevegeek]

As per discussion in #144 would be nice to support automatic_pack_namespace.

I tried to make a stab at this but think I've hit my limits for now.

The changes here seem to produce the correct output with pks list-definitions but the test I added that uses the resolver ie failing... not sure why.

Also I don't know how best to implement the pack configuration parsing to actually parse out the configuration under a nested hash, ie automatic_pack_namespace is actually defined under metadata normally. At the moment I just added the automatic_pack_namespace boolean to the root of the package.yml so I could continue.

I also wasn't sure where to get the packs root path info from while determining the pack namespace name.

Finally I ran into an issue with wanting but go from a String value to a &String in a condition branch, but simply adding a & at the start of the expression resulted in errors about lifetimes of temporary values. So I added a let outside of the conditional but that just feels wrong!

Anyway the diff attached includes TODOs describing the above!

[stevegeek]

@alexevanczuk i know you guys are probably very busy so no pressure on this, but just wanted to reiterate that I think I can't take this any further myself as reached my Rustfu limits. If you prefer I can close the PR and maybe it can be revisited in future by someone else!

[alexevanczuk]

Ah hey, totally up to you. Feel free to close if you don't want to leave dangling PRs open – I can always pull the closed branch to base new work off of.

I was actually just thinking of this as I was using automatic_pack_namespace in my org's codebase and it was bothering me that pks wasn't picking it up automatically and needed the packwerk.yml change. I'll probably get to this at some point.

[stevegeek]

Ok thanks @alexevanczuk , happy to leave it open if you think you might pick it up in future!

[alexevanczuk]

Hey @stevegeek this is now implemented! #214

let me know if it works for you!

[stevegeek]

@alexevanczuk Great thanks so much! Will try it out and let you know.