[feature] enable simple obfuscation of blob size in preamble

use a powers of two ceiling for the reported size in the preamble.
for this to be effective against a passive adversary, cover traffic
should be used in the uploads too.

This is just a first-stop measure; proper research should be done to
determine a good tradeoff between avoiding information leakage and
saving some storage and bandwidth..

- Documentation: #8759
- Related: #8759

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