ci-license-scan: Add proposed whitelist

While working with license scan is very common to add whitelist for
files and folders. To make this job easier, allow ci-license-scan to
propose a whitelist based on known patterns.

This feature is only meant to help developers to reduce the overheard
of the manual work, hence, the proposed changed need to be carefully
reviewed.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>