rust: Prepare Cargo.toml for crates.io

Renames pv crate to s390_pv and pv_core to s390_pv_core. pv was already
taken on crates.io.

Bump the versions of all crates to 0.10.0. From now on we follow Semver
compatibility rules when it comes to updates. patch-level updates will
not introduce any backwards incompatible changes. For now all crates in
this directory will have the same version number. A version update may,
therefore, not add any new things.

Library users in this repository still use the non prefixed names and
rename the crate in the Cargo.toml. Doc-tests have to use the new name
however.

Add some Cargo metadata to the Cargo.toml.

Acked-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>

rust/pv/tests/add_secret_request.rs

@@ -6,7 +6,7 @@ use openssl::{
     nid::Nid,
     pkey::Private,
 };
-use pv::{
+use s390_pv::{
     get_test_asset,
     request::{
         openssl::pkey::{PKey, Public},

rust/pv/tests/cert_verifier.rs

@@ -2,9 +2,9 @@
 //
 // Copyright IBM Corp. 2023
 
-use pv::request::CertVerifier;
-use pv::test_utils::*;
-use pv::{Error, HkdVerifyErrorType::*};
+use s390_pv::request::CertVerifier;
+use s390_pv::test_utils::*;
+use s390_pv::{Error, HkdVerifyErrorType::*};
 use std::ffi::c_int;
 
 #[track_caller]