build(deps): add esbuild as devDependency for @sheepdog/svelte

This is used to run Gravity in CI and capture the bundle size changes

Author: oscard0m

packages/svelte/package.json

@@ -66,6 +66,7 @@
 		"@types/eslint__js": "^8.42.3",
 		"@vitest/coverage-v8": "^2.0.0",
 		"@vitest/ui": "^2.0.0",
+		"esbuild": "^0.23.1",
 		"eslint": "^9.2.0",
 		"eslint-config-prettier": "^9.1.0",
 		"eslint-plugin-playwright": "^1.6.1",