Import kube-rt tree

[clux]

A WIP import that aims to get to point 1 of #148 (comment)

Marking down some key points:

• imported kube-rt codebase (with git subtree add -P kube-runtime [email protected]:teozkr/kube-rt.git master
• made it work as part of workspace with joint examples dir
• consolidate dev-deps
  - [ ] migrate from kube-runtime to kube/src/runtime or kube/src/runtime2 - deprecate old runtime first

The latter migration requires consolidating the normal dependencies and dealing with some unpublishable things:

• deal with pin-cell git dependency - cannot just use 0.1.1 due to:

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> /home/clux/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/pin-cell-0.1.1/src/lib.rs:3:1
  |
3 | #![feature(pin, arbitrary_self_types)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

• deal with #[project] deprecated attr warning RT2: fix pin project deprecation #259

• [ ] unify error handling (move to snafu + inside kube + color_eyre inside examples) can be done if the crates are properly united

• migrate examples from old runtime to new runtime (might save some of these for later so we can do a migration release)

Maybe try to also get examples as a top level directory. Tried that before, but it was slightly annoying with workspaces

[clux]

The last of my core-goals from last week's comment are actually achieved now. Probably going to merge this on the weekend. Controller<K> have this architecture internally and is largely a builder front for Theo's controller (which I've provisionally renamed to applier).

Not sure whether to smash all the crates together into one super-crate or, I know that was the plan, but starting to think that maybe there's a benefit to having the boundaries outside the crate level for #204 . Plus, it also lets us have one kube release that's a proper migration release where people can switch over.

Regardless, will start porting over most of the examples later.

[nightkr]

👍 from me on separate crates.

[praveenperera]

Congrats on this huge merge guys @clux & @teozkr

Very nice work! I’m excited to try the controller out.

It’s going to make it so much easier to build what i’m building!

Thanks!