feat(nix-compat/narinfo/signature): generalize name field

Requiring `name` to be a `&str` means it'll get annoying to pass around
`Signature`, but being able to pass them around in an owned fashion is
kinda a requirement for a stronger typed `PathInfo` struct, where we
want to have full ownership.

Rework the `Signature` struct to become generic over the type of the
`name` field. This means, it becomes possible to have owned versions
of it.

We don't want to impose `String` or `SmolStr` for example, but want to
leave it up to the nix-compat user to decide.

Provide a type alias for the existing `&str` variant (`SignatureRef`),
and use it where we previously used the non-generic `Signature` one.

Add some tests to ensure it's possible to *use* `Signature` with both
`String` and `SmolStr` (but only pull in `smol_str` as dev dependency
for the tests).

Also, add some more docstrings, these were a bit sparse.

Change-Id: I3f75691498c6bda9cd072d2d9dac83c4f6c57287
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12253
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>

tvix/store/src/proto/mod.rs

@@ -221,7 +221,7 @@ impl PathInfo {
                 .signatures
                 .iter()
                 .map(|sig| {
-                    nix_compat::narinfo::Signature::new(
+                    nix_compat::narinfo::SignatureRef::new(
                         &sig.name,
                         // This shouldn't pass validation
                         sig.data[..].try_into().expect("invalid signature len"),