Commits on Mar 25, 2023

1. refactor: Split out clap_builder for faster derive builds …

   For now, we are still treating `clap` as the user facing API for both
   builder and derive, making this an internal change as we don't expect
   this to negatively impact builder build times all that much.  We can
   re-evaluate at a later time and consider having distinct top-level
   crates for builder and derive.
   
   Looking at `--timings` on my machine
   - `clap` only took 0.04s to build and it happened in
     parallel to `clap_builder` codegen
   - this saved 1.7s for derive build times, with `clap_builder` building
     in parallel to `syn` and `clap_builder` and `clap_derive` finishing
     around the same time.
   
   This was discussed some at https://rust-lang.zulipchat.com/#narrow/stream/220302-wg-cli/topic/clap.20build.20times.20and.20.60clap_derive.60.3A.20a.20crazy.20idea

   

   epage committed Mar 25, 2023
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