docs: write patterns guide and example. (#2021)

Add Writes guide and write-patterns example.

.changeset/beige-snails-brush.md

@@ -0,0 +1,5 @@
+---
+"@electric-sql/client": patch
+---
+
+Expose `shape.stream` as public readonly property.

.changeset/tender-seas-stare.md

@@ -0,0 +1,5 @@
+---
+"@electric-sql/react": patch
+---
+
+Expose `stream` in the useShape result data. This allows React components to easily access the stream to match on.

examples/write-patterns/vite.config.ts

@@ -1,6 +1,5 @@
 import { defineConfig } from 'vite'
 import { VitePWA } from 'vite-plugin-pwa'
-
 import react from '@vitejs/plugin-react'
 
 // https://vitejs.dev/config/