feat: add layer size summary from manifest#20
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What does this PR do?
Adds calculation of total compressed layer size from the Docker image manifest to introduce a new Dockle check to validate image size limits.
The new check will be PR'ed to Dockle after this one approved.
Why?
Prevents oversized images by allowing users to set size budgets in their security pipeline. In case of security smaller images have smaller attack surface.
Changes
sizefields of all layers, add this value to/configfile provided bydeckoder