[Feature Request]: Autodiscovery as its own package

[Wulfheart]

Description

Some days ago I saw a thread about it one the project's discord but unfortunately I am unable to find it again.
I really like the Autodiscovery feature and I would like to use this specific component in non-tempest projects. Therefore, I am proposing the following:

1. Move Tempest\Core\{DiscoversPath,Discovery,DiscoveryException,DiscoveryItems,DicoveryLocation,IsDiscovery,DoNotDiscover} to Tempest\Discovery
2. Tempest\Core\{DiscoveryCache,DiscoveryCachingStrategyChangedException,et al.} stay in core as they are tied to the Tempest specific implementation
3. Tempest\Core\Kernel\LoadDiscoveryClasses will also remain where it is right now as users of the Discovery package will have to provide their own strategy on how to load.
4. The package tempest/discovery will have a dependency on tempest/reflection. As far as I can see this should be enough.

Benefits

I really enjoy the autodiscovery component and would love to use it in projects outside of tempest. I can also provide a PR if you are not opposed to it.

[aidan-casey]

@Wulfheart I haven't moved around any namespaces yet, but what are your thoughts on the implementation in #815?

[brendt]

@aidan-casey I don't really see how the two PRs relate. Yours is about performance. Agreed, you also made some structural changes, but @Wulfheart 's proposal seems simpler and also makes sense.

Here are my thoughts:

• @Wulfheart I'm open for a PR that pulls discovery into a separate package
• From what I understand, the standalone package would have no link to the container? I wonder how that would play out in practice. We'd probably need bridges for popular frameworks.
• @aidan-casey after this refactor, we explore your changes, because the performance part does matter. But let's keep each PR focused on one thing.

[brendt]

As a followup:

Tempest\Core\Kernel\LoadDiscoveryClasses will also remain where it is right now as users of the Discovery package will have to provide their own strategy on how to load.

I wonder if it makes sense to have a "default strategy" included in tempest/discovery? @Wulfheart feel free to share input based on your experiences