chore: add linting to avm-transpiler CI (#6732)

This PR adds linting and formatting to the AVM transpiler's CI checks.
My main reasoning for this is that I noticed in #6730 that we're pulling
in the whole of the Noir compiler for some reason but not actually using
it, this could have been caught with clippy lints.

I've also copied across the `.rustfmt.toml` from Noir as this prevents
some shorter lines being split over multiple lines (which improves
readability imo). Happy to revert this change if it's unwanted.

.github/workflows/ci.yml

@@ -40,6 +40,7 @@ jobs:
       pull-requests: read
     # Set job outputs to values from filter step
     outputs:
+      avm-transpiler: ${{ steps.filter.outputs.avm-transpiler }}
       barretenberg: ${{ steps.filter.outputs.barretenberg }}
       barretenberg-cpp: ${{ steps.filter.outputs.barretenberg-cpp }}
       noir: ${{ steps.filter.outputs.noir }}
@@ -61,6 +62,8 @@ jobs:
               - 'barretenberg/cpp/**'
             noir:
               - 'noir/**'
+            avm-transpiler:
+              - 'avm-transpiler/**'
             l1-contracts:
               - 'l1-contracts/**'
             noir-projects:
@@ -419,6 +422,21 @@ jobs:
         timeout-minutes: 40
         run: earthly-ci --no-output ./noir-projects/+test
 
+  avm-format:
+    needs: [setup, changes]
+    runs-on: ${{ github.event.pull_request.user.login || github.actor }}-x86
+    if: ${{ needs.changes.outputs.avm-transpiler == 'true' || needs.changes.outputs.noir == 'true' }}
+    steps:
+      - uses: actions/checkout@v4
+        with: { ref: "${{ env.GIT_COMMIT }}" }
+      - uses: ./.github/ci-setup-action
+        with:
+          concurrency_key: avm-transpiler-format-x86
+      - name: "Format AVM transpiler"
+        working-directory: ./avm-transpiler/
+        timeout-minutes: 40
+        run: earthly-ci --no-output ./+format
+
   yarn-project-formatting:
     needs: build
     runs-on: ${{ github.event.pull_request.user.login || github.actor }}-x86
@@ -631,6 +649,7 @@ jobs:
       - noir-examples
       - noir-packages-test
       - noir-projects
+      - avm-format
       - yarn-project-formatting
       - yarn-project-test
       - prover-client-test
@@ -680,6 +699,7 @@ jobs:
       - noir-examples
       - noir-packages-test
       - noir-projects
+      - avm-format
       - yarn-project-formatting
       - yarn-project-test
       - prover-client-test

avm-transpiler/.rustfmt.toml

@@ -0,0 +1,2 @@
+edition = "2018"
+use_small_heuristics = "Max"