This is a referendum whose purpose is to perform a runtime upgrade on Pendulum for the public launch of Spacewalk

For all details and new features related to this release, see the [Github release page](https://github.com/pendulum-chain/pendulum/releases/tag/pendulum-release-12).

**Key implementations:**

* Adding all Spacewalk-related pallets to Pendulum and configuring them appropriately.
* This referendum is a significant step forward in the development and growth of our network



Schedule a majority-carries referendum to be tabled next once it is legal to schedule
an external referendum.

The dispatch of this call must be `ExternalMajorityOrigin`.

- `proposal_hash`: The preimage hash of the proposal.

Unlike `external_propose`, blacklisting has no effect on this and it may replace a
pre-scheduled `external_propose` call.

Weight: `O(1)`

Authorize an upgrade to a given `code_hash` for the runtime. The runtime can be supplied
later.

The `check_version` parameter sets a boolean flag for whether or not the runtime's spec
version and name should be verified on upgrade. Since the authorization only has a hash,
it cannot actually perform the verification.

This call requires Root origin.

Problem Statement & Audience:
- Problem: The Pendulum network needs a runtime upgrade for the public launch of Spacewalk.
- Audience: Members of the Polkassembly council.

Significance:
- This referendum is a significant step forward in the development and growth of the Pendulum network.

Proposed Solution:
- Perform a runtime upgrade on Pendulum by adding all Spacewalk-related pallets and configuring them appropriately.

Expected Outcomes:
- The public launch of Spacewalk on the Pendulum network.

#17 Authorize runtime upgrade to Pendulum release 12