Add dependency points in the resolver also to providers

We were traditionally adding points for some dependency types to the
real package, but we should also do it for providers of that package to
help the resolver especially if the real package is for some reason not
tagged for removal yet/anymore.

While at it we ensure that the points are only attributed once for each
package as especially with versioned provides a package can nowadays
provide another many times and would hence acquire a lot of points.

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