[a2] Create a place for the A2 framework

- **Stub out A2 package.**
- **Add Gemini BGL**
- **Get the basic test framework in.**
- **Add template for new tests.**
- **Fix up the version for the future bump.**
- **docs(changeset): Create a place for the A2 framework**

Progress on #4101.

.changeset/sixty-parents-raise.md

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+---
+"@breadboard-ai/a2": minor
+---
+
+Create a place for the A2 framework

packages/a2/.npmignore

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+.env
+tsconfig.tsbuildinfo

packages/a2/README.md

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+# Your README goes here

packages/a2/package.json

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+{
+  "name": "@breadboard-ai/a2",
+  "publishConfig": {
+    "registry": "https://wombat-dressing-room.appspot.com"
+  },
+  "version": "0.0.1",
+  "description": "Breadboard Components for building AI systems",
+  "exports": {
+    "gemini": "./bgl/a2-gemini.bgl.json"
+  },
+  "type": "module",
+  "repository": {
+    "directory": "packages/a2",
+    "type": "git",
+    "url": "https://github.com/breadboard-ai/breadboard.git"
+  },
+  "keywords": [],
+  "author": "Google Labs Team",
+  "license": "Apache-2.0",
+  "bugs": {
+    "url": "https://github.com/breadboard-ai/breadboard/issues"
+  },
+  "homepage": "https://github.com/breadboard-ai/breadboard#readme",
+  "devDependencies": {
+    "@typescript-eslint/eslint-plugin": "^7.18.0",
+    "@typescript-eslint/parser": "^7.18.0",
+    "@types/node": "^22.0.0",
+    "typescript": "^5.6.3"
+  }
+}