Switch to Criterion for benchtests.

ci: Add benches to workflow.

Signed-off-by: Jason Volk <jason@zemos.net>

src/database/Cargo.toml

@@ -11,11 +11,16 @@ version.workspace = true
 
 [lib]
 path = "mod.rs"
+bench = false
 crate-type = [
 	"rlib",
 #	"dylib",
 ]
 
+[[bench]]
+name = "ser"
+harness = false
+
 [features]
 bzip2_compression = [
 	"rust-rocksdb/bzip2",
@@ -66,5 +71,8 @@ tokio.workspace = true
 tracing.workspace = true
 tuwunel-core.workspace = true
 
+[dev-dependencies]
+criterion.workspace = true
+
 [lints]
 workspace = true