pw_stream: Construct MemoryWriter w/prepopulated buffer No-Docs-Update-Reason: Adding helper constructor, usage in header. Change-Id: Ic85c45d92096b47ff88dc7284fe4921aa7063335 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/48720 Reviewed-by: Armando Montanez <amontanez@google.com> Reviewed-by: Wyatt Hepler <hepler@google.com> Pigweed-Auto-Submit: Prashanth Swaminathan <prashanthsw@google.com> Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
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