chore: add cargo fmt precommit hook (#2666)

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## Changes

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Author: NathanFlurry

lefthook.yml

@@ -0,0 +1,7 @@
+pre-commit:
+  parallel: true
+  commands:
+    fmt:
+      run: cargo fmt --all -- --check
+      fail_text: "Code is not formatted. Run 'cargo fmt' and commit again."
+