Add criterion benches for statement-store (#9884)

# Description

Adds micro benches simulating concurrent work with the statement-store.

## Integration

This PR does not not affect downstream projects.

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Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: 2 people

Cargo.lock

@@ -0,0 +1,14 @@
+title: Add criterion benches for statement-store
+doc:
+- audience: Node Dev
+  description: |-
+    # Description
+
+    Adds micro benches simulating concurrent work with the statement-store.
+
+    ## Integration
+
+    This PR does not not affect downstream projects.
+crates:
+- name: sc-statement-store
+  bump: none

prdoc/pr_9884.prdoc

@@ -30,5 +30,11 @@ sp-statement-store = { workspace = true, default-features = true }
 tokio = { features = ["time"], workspace = true, default-features = true }
 
 [dev-dependencies]
+criterion = { workspace = true, default-features = true }
 sp-tracing = { workspace = true }
 tempfile = { workspace = true }
+
+[[bench]]
+name = "statement_store"
+harness = false
+required-features = []