Auto merge of #43604 - abonander:proc_macro_span_api, r=jseyfried
Improvements to `proc_macro::Span` API Motivation: https://internals.rust-lang.org/t/better-panic-location-reporting-for-unwrap-and-friends/5042/12?u=logician TODO: - [x] Bikeshedding/complete API - [x] Implement tests/verify return values cc @jseyfried @nrc
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