PVF: Refactor workers into separate crates, remove host dependency (#7253)

* PVF: Refactor workers into separate crates, remove host dependency

* Fix compile error

* Remove some leftover code

* Fix compile errors

* Update Cargo.lock

* Remove worker main.rs files

I accidentally copied these from the other PR. This PR isn't intended to
introduce standalone workers yet.

* Address review comments

* cargo fmt

* Update a couple of comments

* Update log targets

polkadot/parachain/test-parachains/undying/collator/Cargo.toml

@@ -34,7 +34,7 @@ sc-service = { git = "https://github.com/paritytech/substrate", branch = "master
 # This one is tricky. Even though it is not used directly by the collator, we still need it for the
 # `puppet_worker` binary, which is required for the integration test. However, this shouldn't be
 # a big problem since it is used transitively anyway.
-polkadot-node-core-pvf-worker = { path = "../../../../node/core/pvf/worker" }
+polkadot-node-core-pvf = { path = "../../../../node/core/pvf" }
 
 [dev-dependencies]
 polkadot-parachain = { path = "../../.." }

polkadot/parachain/test-parachains/undying/collator/bin/puppet_worker.rs

@@ -14,4 +14,4 @@
 // You should have received a copy of the GNU General Public License
 // along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
 
-polkadot_node_core_pvf_worker::decl_puppet_worker_main!();
+polkadot_node_core_pvf::decl_puppet_worker_main!();

polkadot/parachain/test-parachains/undying/collator/src/lib.rs

@@ -354,7 +354,7 @@ mod tests {
 	}
 
 	fn validate_collation(collator: &Collator, parent_head: HeadData, collation: Collation) {
-		use polkadot_node_core_pvf_worker::testing::validate_candidate;
+		use polkadot_node_core_pvf::testing::validate_candidate;
 
 		let block_data = match collation.proof_of_validity {
 			MaybeCompressedPoV::Raw(pov) => pov.block_data,