Dear Moonbeam community!

Due to Multichain bridge no longer serving its function in transferring assets between EVM chains and Polkadot, we propose to burn Multichain's XC-20 tokens and unlock 30000 GLMR tokens. The purpose is to make these assets available for use elsewhere for the benefit of the entire Polkadot ecosystem.

XC-20 tokens ids: 
- xcWBTC: `278750993613512357835566279094880339619` 
- xcETH: `228256396637196286254896220398224702687` 
- xcUSDC: `337110116006454532607322340792629567158`

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 except `None`.

- `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 the calls are dispatched without checking origin filter. (This
includes bypassing `frame_system::Config::BaseCallFilter`).

## Complexity
- O(C) where C is the number of calls to be batched.

- The Multichain bridge is no longer working.
- We want to burn Multichain's XC-20 tokens and unlock GLMR tokens.
- This will help the Polkadot ecosystem.
- The XC-20 tokens are xcWBTC, xcETH, and xcUSDC.
- We want to use the assets somewhere else.

#24 Destroying Multichain XC-20 mintable tokens