gnu: Convert all rust crates to new format.

* gnu/packages/crates-io.scm: Rename all packages to contain version
string.
[source]: Rename all downloaded files to use '.crate'.
[arguments]: Remove all cargo-inputs and cargo-development-inputs.
Comment out all custom phases to link to external libraries.
[native-inputs, inputs]: Comment out all inputs.
[properties]: Mark all packages hidden.