Extend the `OSCustomizations` with a list of custom files and
directories, that should be created in the image. If any `Files` or
`Directories` are specified in the `OSCustomizations`, the appropriate
osbuild stages will be added to the `os` pipeline. In addition to that,
any custom files data will be returned by the `getInline()` method of
the `os` pipeline.
This customization can't be yet used by users, because the translation
from BP customization to the `OSCustomizations` is missing.
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
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