Send a batch of dispatch calls and atomically execute them.
The whole transaction will rollback and fail if any of the calls failed.

May be called from any origin.

- `calls`: The calls to be dispatched from the same origin. The number of call must not
  exceed the constant: `batched_calls_limit` (available in constant metadata).

If origin is root then call are dispatch without checking origin filter. (This includes
bypassing `frame_system::Config::BaseCallFilter`).

# <weight>
- Complexity: O(C) where C is the number of calls to be batched.
# </weight>

- The post is about a proposal to not vote.
- It is a short summary of the post.
- The proposal is about not participating in voting.
- It is not clear why the proposal suggests not voting.
- The post is written for a website called polkassembly.

#257 test proposal to check that preimage for fix for preimage migration of 248 referenda