Add reusable workflows for fmt and security_audit

.github/workflows/fmt.yml

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+permissions:
+  contents: read
+
+on:
+  workflow_call:
+
+env:
+  CARGO_INCREMENTAL: 0
+  CARGO_NET_GIT_FETCH_WITH_CLI: true
+  CARGO_NET_RETRY: 10
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
+  RUSTFLAGS: -D warnings
+  RUSTDOCFLAGS: -D warnings
+  RUSTUP_MAX_RETRIES: 10
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  fmt:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Rust
+        run: rustup update stable
+      - run: cargo fmt --all --check

.github/workflows/security_audit.yml

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+permissions:
+  contents: read
+
+on:
+  workflow_call:
+    secrets:
+      GITHUB_TOKEN:
+        required: true
+
+env:
+  CARGO_INCREMENTAL: 0
+  CARGO_NET_GIT_FETCH_WITH_CLI: true
+  CARGO_NET_RETRY: 10
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
+  RUSTFLAGS: -D warnings
+  RUSTDOCFLAGS: -D warnings
+  RUSTUP_MAX_RETRIES: 10
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  security_audit:
+    permissions:
+      checks: write
+      contents: read
+      issues: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Rust
+        run: rustup update stable
+      # rustsec/audit-check used to do this automatically
+      - name: Generate Cargo.lock
+        run: cargo generate-lockfile
+      # https://github.com/rustsec/audit-check/issues/2
+      - uses: rustsec/[email protected]
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}