shared/util: improve byte parsing
shared/util: improve byte parsing

- GetByteSizeString() --> switch to IEEE 1541 standardized "B" suffix
- ParseByteSizeString() --> handle "B" suffix and legacy " bytes" suffix

Signed-off-by: Christian Brauner <48455ab3070520a2d174545c7239d6d0fabd9a83@ubuntu.com>

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