Pr 1055 traced error err into#3
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## Motivation
Right now TracedError is pretty much incompatible with enum heavy error
handling implementations. The way its currently designed you'd have to make
sure that each leaf error independently is wrapped in a `TracedError` so that
all sources end up capturing a SpanTrace.
## Solution
To resolve this I've added a `map` method for transforming the inner type of a
TracedError while preserving the existing SpanTrace. This is still a bit
cumbersome, where before you'd be able to write `result.map_err(|source|
MyError { source, some_context })` now you'll have to write
`result.map_err(|source| source.map(|source| MyError { source, some_context
}))`. To fix this we should probably eventually add an extension trait on
`Result` but I want to experiment with that half of the change in `zebra`
before committing to an API, since it can easily be done out of tree.
Co-authored-by: Eliza Weisman <eliza@buoyant.io>
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"local" version of tokio-rs#3555