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* attributes: implement `#[instrument(ret)]`
## Motivation
Currently, users have to explicitly call logging functions at the end of
functions if they wanted to record values being returned. For example,
```rust
fn increment(a: i32) -> i32 {
let succ = a + 1;
tracing::debug!(?succ);
succ
}
```
The code above will be significantly simpler if we provide the
functionality to record returned values.
## Solution
This PR adds the exact feature we're talking here, which enables users
to write the code below instead.
```rust
#[instrument(ret)]
fn increment(a: i32) -> i32 {
a + 1
}
```
Co-authored-by: Eliza Weisman <eliza@buoyant.io>