CI: Add program and all extra steps

#### Problem

The token program now lives in its program-specific repo, but no part of
it is being exercised by CI.

#### Summary of changes

Integrate the token program properly into CI. This includes:

* add it to the Cargo workspace, and removing spl-token-client, since
  it's currently empty
* run lint / format / test on the program
* run spellcheck / audit / semver checks on the Rust packages
* move rust scripts to `scripts/rust` and make them reusable
* update to Solana 2.1 and proper rust toolchains

Author: joncinque

.github/workflows/main.yml

@@ -43,6 +43,85 @@ jobs:
       - name: Lint Client Rust
         run: pnpm clients:rust:lint
 
+  format_and_lint_program:
+    name: Format & Lint Program
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Environment
+        uses: ./.github/actions/setup
+        with:
+          clippy: true
+          rustfmt: true
+
+      - name: Format
+        run: pnpm programs:format
+
+      - name: Lint
+        run: pnpm programs:lint
+
+  audit_rust:
+    name: Audit Rust
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Environment
+        uses: ./.github/actions/setup
+        with:
+          cargo-cache-key: cargo-audit
+
+      - name: Install cargo-audit
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-audit
+
+      - name: Run cargo-audit
+        run: pnpm rust:audit
+
+  semver_rust:
+    name: Check semver Rust
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Environment
+        uses: ./.github/actions/setup
+        with:
+          cargo-cache-key: cargo-semver
+
+      - name: Install cargo-audit
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-semver-checks
+
+      - name: Run semver checks
+        run: pnpm rust:semver
+
+  spellcheck_rust:
+    name: Spellcheck Rust
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Environment
+        uses: ./.github/actions/setup
+        with:
+          cargo-cache-key: cargo-spellcheck
+
+      - name: Install cargo-spellcheck
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-spellcheck
+
+      - name: Run cargo-spellcheck
+        run: pnpm rust:spellcheck
+
   generate_clients:
     name: Check Client Generation
     runs-on: ubuntu-latest
@@ -96,3 +175,20 @@ jobs:
 
       - name: Test Client Rust
         run: pnpm clients:rust:test
+
+  test_program:
+    name: Test Program
+    runs-on: ubuntu-latest
+    needs: format_and_lint_program
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Environment
+        uses: ./.github/actions/setup
+        with:
+          cargo-cache-key: cargo-rust-client
+          solana: true
+
+      - name: Test
+        run: pnpm programs:test