Change PackageSupplier interface to accept VersionRange ...

This is a leftover of the time when everything in dub accepted Dependency.
While the mess had been untangled, doing so on this interface proved harder,
as there is no good way to deprecate it in a fully backward-compatible manner
without introducing a lot of overhead (a new type). Instead, this uses
a middle ground approach, where the external implementers (which most likely
do not exists) would break (although the fix is trivial), but callers would not.

Keep logging functionality out of the public API as requested in https://github.com/dlang/dub/pull/2124#issuecomment-813016939.

New logging module - initial functionality ...

The new module replaces dub.internal.vibecompat.core.log by using the
same function names, but implementing colored output and the left
fixed-width tag. Overloaded functions are provided to output colored
text.

Still missing initLogging() and non-TTY stdout/stderr detection

RegistryPackageSupplier.genPackageDownloadUrl added

Use queryString to setup the pacakge parameters

Don't catch failed metadata requests with a Json(null) object

Update registry URL + test payload

Update package dependency URL

use single api request to fill metadata cache for all dependencies ...

- avoids various RTTs and possible failures

Use new minimized API endpoint for package queries

Retry download for registry search packages

Refactor retry download

Split-up package suppliers into individual modules