Open HRMP channel between Statemine & Picasso

This proposal aims to open HRMP channel between Statemine & Picasso. For more context please read here.

Let me explain the technical details of this call. It is a batch transaction with two calls:

1. A force transfer from Kusama treasury (F3opxRbN5ZbjJNU511Kj2TLuzFcDq9BGduA9TgiECafpg29) to Statemine (F7fq1jSNVTPfJmaHaXCMtatT1EZefCUsa7rRiQVNR5efcah). The amount is 11 KSM. 10 KSM will be used for deposit to accept (5 KSM) and open (5 KSM) HRMP channel. 1 KSM will be used by Statemine parachain to pay for transaction execution fee on Kusama. Note that 1 KSM is more than enough and unused funds will be trapped in XCM asset trap. But that's totally fine as it can be claimed & used for transaction fee in later XCM executions.

2. Send XCM message to Statemine to execute a transaction with superuser (root) permission.

The XCM message to Statemine is 0x1f00010100020c000400000000070010a5d4e81300000000070010a5d4e800060002286bee5c1802083c01270800003c0027080000e803000000900100, which can be decoded on Statemine, and it is polkadotXcm.send. It sends a XCM message back to Kusama, to with 1 KSM for transaction fee and perform a transact of call 0x1802083c01270800003c0027080000e803000000900100.

The call is is a batchAll that accepts open channel request from Picasso, and make an open channel request to Picasso.