feat(plugin): add v2 effect host (#33111)

packages/plugin/src/v2/effect/plugin.ts

@@ -0,0 +1,11 @@
+import type { Effect, Scope } from "effect"
+import type { PluginHost } from "./host.js"
+
+export interface Plugin<R = never> {
+  readonly id: string
+  readonly effect: (host: PluginHost) => Effect.Effect<void, never, R | Scope.Scope>
+}
+
+export function define<R>(plugin: Plugin<R>) {
+  return plugin
+}