Commits on Mar 25, 2022

1. subscriber: add Subscribe::boxed method …

   ## Motivation
   
   PR #2023 made the `impl Subscribe` for boxed `dyn Subscribe` trait
   objects actually be useful. One minor annoyance when working with boxed
   trait objects is that, in some cases, in order to use `Box::new` to
   erase a subscriber's type, it's necessary to add a type annotation like
   this:
   ```rust
   let boxed_subscriber: Box<dyn Subscribe<_> + Send + Sync + 'static>
       = Box::new(some_subscriber);
   ```
   
   Because the trait object includes `Send + Sync + 'static`, this is a bit
   wordy to type out.
   
   ## Solution
   
   This commit adds a `Subscribe::boxed` method that takes `Self` and boxes
   it as a type-erased `dyn Subscribe` trait object. This can then be
   chained after a a chain of subscriber builder methods. Because the
   `boxed` method _explicitly_ returns a `dyn Subscribe + ...` trait
   object, it's not necessary to use a wordy type annotation when
   using this method.

   

   hawkw committed Mar 25, 2022
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