fix cuda repo parsing

[paulcacheux]

This PR fixes some repository parsing that was wrong. Especially the following repo:

>> cat /host/etc/apt/sources.list.d/cuda-ubuntu2204-x86_64.list
deb [signed-by=/usr/share/keyrings/cuda-archive-keyring.gpg] https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2204/x86_64/ /

Fixes:

• components parsing: strings.Split("", " ") == []string{""} (and not nil), which was confusing the components splitting
• the options parsing was done incorrectly by the upstream lib resulting in bad detection of the URI/distribution/components

Since the upstream APT lib is unmaintained, it was decided to simply bring the small function into our own code, with the added fixes.