CI: Update repo to run CI on imported packages (#56)

#### Problem

The repo has imported many packages from SPL, but they aren't properly
integrated, since they can't be built, CI isn't running, etc.

#### Summary of changes

It's a bit of a suite of changes, but they get the repo up and running
with the program and everything! Here are the changes:

* update to Solana v2.1 crates and rust toolchain
* add new packages to Cargo workspace
* update Rust packages to use crates.io versions where applicable
* move program-2022-tests into clients/rust-legacy/tests
* remove `test-sbf` feature on program-2022-tests
* add `[package.metadata.solana.program-id]` for token-2022 and elgamal
  registry
* update JS legacy tests to use validator started with `start-validator.mjs`
* add concept of "fixture programs" to load programs from the test
  fixtures directory during JS legacy tests
* make scripts language-specific instead of package-specific, to reuse
  the JS and rust scripts
* remove Token-2022 as a downloaded program, opt for the built version
* add package.json entries to run build / test / format / lint for the
  program / cli / rust-legacy / js-legacy / confidential transfer
* execute the new steps in CI

.github/actions/setup/action.yml

@@ -19,6 +19,12 @@ inputs:
   solana:
     description: Install Solana if `true`. Defaults to `false`.
     required: false
+  cli:
+    description: Install CLI dependencies if `true`. Defaults to `false`.
+    required: false
+  purge:
+    description: Purge unused directories if `true`. Defaults to `false`.
+    required: false
 
 runs:
   using: 'composite'
@@ -32,6 +38,25 @@ runs:
         node-version: 20
         cache: 'pnpm'
 
+    - name: Purge unused ubuntu runner directories
+      if: ${{ inputs.purge == 'true' }}
+      shell: bash
+      run: |
+        sudo rm -rf /usr/share/dotnet
+        sudo rm -rf /usr/share/swift
+        sudo rm -rf /usr/share/mysql
+        sudo rm -rf /usr/share/az_*
+        sudo rm -rf /usr/share/postgresql-common
+        sudo rm -rf /opt/ghc
+        sudo rm -rf /opt/az
+        sudo rm -rf /opt/pipx
+        sudo rm -rf /opt/microsoft
+        sudo rm -rf /opt/google
+        sudo rm -rf /opt/hostedtoolcache
+        sudo rm -rf /usr/local/lib/android
+        sudo rm -rf /usr/local/lib/heroku
+        sudo rm -rf /imagegeneration
+
     - name: Install Dependencies
       run: pnpm install --frozen-lockfile
       shell: bash
@@ -61,6 +86,11 @@ runs:
         version: ${{ env.SOLANA_VERSION }}
         cache: true
 
+    - name: Install CLI dependencies
+      if: ${{ inputs.cli == 'true' }}
+      shell: bash
+      run: sudo apt install libudev-dev protobuf-compiler -y
+
     - name: Cache Cargo Dependencies
       if: ${{ inputs.cargo-cache-key && !inputs.cargo-cache-fallback-key }}
       uses: actions/cache@v4