Improvement: Make guix import crate easier to use

I very happily discovered guix import after trying to write a package def for a rust crate, but ran into this:

;;; Failed to autoload string->semver-range in (semver ranges):

;;; no code for module (semver ranges)

<<backtrace>>

guix/import/crate.scm:260:26: In procedure find-crate-version:error: string->semver-range: unbound variable

Turns out it's because guix import has a soft dep on guile-semver, but intentionally leaves it out since most users won't need it. (See: http://logs.guix.gnu.org/guix/2023-01-28.log#005327)

The dependency is small: 0.4MB. Could we either add it as a hard dep, or at least document at https://guix.gnu.org/manual/en/html_node/Invoking-guix-import.htmlso it is easier to discover how to use guix import crate?

Probably same sort of thing for Guile-Lib for the go importer.

Thanks!

Best Regards,

Benjamin Cherry

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