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These will be used by bots & diagnose_bloat.py for measuring binary
size.

Also updates related code in apk_operations.py:
 * Makes --output-apks required for build-bundle-apks
 * Adds --minimal for build-bundle-apks
 * Logs bundletool commands when in verbose mode

Bug: 873714
Change-Id: I6fb4bcc366110cacfd8e1b772db4ea1e00f81cc9
Reviewed-on: https://chromium-review.googlesource.com/c/1456223Reviewed-by: David Turner <digit@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630017}