[static-build] Use esbuild (#10462)

Switch to using esbuild to compile + bundle `@vercel/static-build`.

utils/build-builder.mjs

@@ -0,0 +1,20 @@
+/**
+ * This script is the build configuration common to all our Builder packages.
+ * We bundle the output using `esbuild`, and do not publish type definitions.
+ *
+ * `@vercel/build-utils` is marked as external because it's always an implicit
+ * dependency when the Builder is invoked by `vercel build`.
+ */
+import { join } from 'node:path';
+import { readFileSync } from 'node:fs';
+import { esbuild } from './build.mjs';
+
+const pkgPath = join(process.cwd(), 'package.json');
+const pkg = JSON.parse(readFileSync(pkgPath, 'utf8'));
+
+const externals = Object.keys(pkg.dependencies || {});
+
+await esbuild({
+  bundle: true,
+  external: ['@vercel/build-utils', ...externals],
+});