feat: add abstraction around task

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/churn/src/agent/task.rs

@@ -0,0 +1,45 @@
+use std::sync::Arc;
+
+#[async_trait::async_trait]
+pub trait Task {
+    fn id(&self) -> String;
+    async fn should_run(&self) -> anyhow::Result<bool> {
+        Ok(true)
+    }
+    async fn execute(&self) -> anyhow::Result<()>;
+}
+
+pub trait IntoTask {
+    fn into_task(self) -> ConcreteTask;
+}
+
+#[derive(Clone)]
+pub struct ConcreteTask {
+    inner: Arc<dyn Task + Sync + Send + 'static>,
+}
+
+impl ConcreteTask {
+    pub fn new<T: Task + Sync + Send + 'static>(t: T) -> Self {
+        Self { inner: Arc::new(t) }
+    }
+}
+
+impl std::ops::Deref for ConcreteTask {
+    type Target = Arc<dyn Task + Sync + Send + 'static>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.inner
+    }
+}
+
+impl IntoTask for ConcreteTask {
+    fn into_task(self) -> ConcreteTask {
+        self
+    }
+}
+
+impl<T: Task + Sync + Send + 'static> IntoTask for T {
+    fn into_task(self) -> ConcreteTask {
+        ConcreteTask::new(self)
+    }
+}