Basic self-reporting, core part (#5129)

Part of https://github.com/deltachat/deltachat-android/issues/2909

For now, this is only sending a few basic metrics.

deltachat-jsonrpc/src/api.rs

@@ -325,6 +325,11 @@ impl CommandApi {
         ctx.get_info().await
     }
 
+    async fn draft_self_report(&self, account_id: u32) -> Result<u32> {
+        let ctx = self.get_context(account_id).await?;
+        Ok(ctx.draft_self_report().await?.to_u32())
+    }
+
     /// Sets the given configuration key.
     async fn set_config(&self, account_id: u32, key: String, value: Option<String>) -> Result<()> {
         let ctx = self.get_context(account_id).await?;