* guix/import/crate.scm: Add guile-semver as a soft dependency.
(make-crate-sexp): Don't allow other keys. Add '#:skip-build?' to build
system args. Pass a VERSION argument to 'cargo-inputs'.
(crate->guix-package): Use guile-semver to resolve the correct module
versions. Treat "build" dependencies as normal dependencies.
(crate-name->package-name): Reuse the procedure 'guix-name' instead of
duplicating its logic.
* guix/import/utils.scm (package-names->package-inputs): Implement
handling of (name version) pairs.
* guix/scripts/import/crate.scm (guix-import-crate): Use
crate-recursive-import instead of duplicate code.
* tests/crate.scm (recursive-import): Change test packages versions to be
distinguishable. Add version data to the test. Check created symbols, too.
Co-authored-by: Hartmut Goebel <h.goebel@crazy-compilers.com>
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