Fix & Improve aggregates + Add permission commands (#330)

* Rewrite aggregate with fixes/improvements + add permission commands

* Add all aggregate tests

Author: philogicae

src/aleph_client/__main__.py

@@ -23,7 +23,9 @@
     name="message",
     help="Manage messages (post, amend, watch and forget) on aleph.im & twentysix.cloud",
 )
-app.add_typer(aggregate.app, name="aggregate", help="Manage aggregate messages on aleph.im & twentysix.cloud")
+app.add_typer(
+    aggregate.app, name="aggregate", help="Manage aggregate messages and permissions on aleph.im & twentysix.cloud"
+)
 app.add_typer(files.app, name="file", help="Manage files (upload and pin on IPFS) on aleph.im & twentysix.cloud")
 app.add_typer(program.app, name="program", help="Manage programs (micro-VMs) on aleph.im & twentysix.cloud")
 app.add_typer(instance.app, name="instance", help="Manage instances (VMs) on aleph.im & twentysix.cloud")