Coroutines Conversion: convert Blob::BlobInputStream #864
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As part of the effort to begin broader adoption of coroutines across the codebase, I plan to open a number of small examplar PRs as part of the preparation for the larger effort to devise and document a plan for the larger effort. This is largely intended to help tease out whether there are any particularly thorny issues that may be uncovered while we go through the process, but also to provide examples for the team on how the conversion can be done.
This PR picks one small API largely at random (Blob::BlobInputStream) that is easy to convert.
And since I'm in the code, I'm also taking the opportunity to do a bit of Drive By cleanup, documentation, and minor refactoring to simplify impl along the way.