chore: Publish v4 sdk (#10927)

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<!-- start pr-codex -->

---

## PR-Codex overview
This PR focuses on publishing the `@pancakeswap/v4-sdk` package,
changing its visibility from private to public and updating its
metadata.

### Detailed summary
- Updated `package.json` for `@pancakeswap/v4-sdk`:
  - Changed `"private"` from `true` to `false`.
  - Modified `publishConfig` to set `"access"` to `public`.
  - Updated `keywords` by replacing `"bsc"` with `"v4"`.

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.changeset/happy-pianos-kneel.md

@@ -0,0 +1,5 @@
+---
+'@pancakeswap/v4-sdk': patch
+---
+
+Publish V4 SDK

packages/v4-sdk/package.json

@@ -1,7 +1,6 @@
 {
   "name": "@pancakeswap/v4-sdk",
   "license": "MIT",
-  "private": true,
   "publishConfig": {
     "access": "public"
   },
@@ -12,7 +11,7 @@
   ],
   "keywords": [
     "pancakeswap",
-    "bsc"
+    "v4"
   ],
   "sideEffects": false,
   "main": "dist/index.js",