Commits on Jul 19, 2023

1. Split the weavelet in two. …

   Before this PR, we had a weavelet that was used by all the deployers.
   This made the weavelet code a bit hard to follow. I would say 75% of the
   weavelet code only ran in multiprocess mode (e.g., setting up internal
   listeners, updating routing info, setting up mTLS), but some bits of
   code only ran in single process mode. The control flow of this code was
   also dictated by a combination of a `Bootstrap` struct passed via a
   `context.Context`, some environment variables, and the `Env` interface
   (which was only partially implemented in the single process case).
   
   This PR splits the weavelet in two. First, I introduce a new `Weavelet`
   interface that borrows from the old `private.App` interface:
   
   ```go
   type Weavelet interface {
       GetIntf(t reflect.Type) (any, error)
       GetImpl(t reflect.Type) (any, error)
   }
   ```
   
   Conceptually, a `Weavelet` is something that hosts components, and it
   provides an API to get a handle to these components.
   
   Next, I introduce a `SingleWeavelet` implementation that is used by `go
   run .` and `weaver single deploy` and a `RemoteWeavelet` implementation
   that is used by all other deployers.

   

   mwhittaker committed Jul 19, 2023
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