AssetHub <> Relay reserve flippening

[jak-pan]

We should flip the source of truth for AH and Polkadot for DOT reserves. This will allow us to use AH with DOT as fee payment and also transfer it through AH to other chains.

As a result we can then use the various features of the new XCM functions to transfer and pay fees which is not possible to do through Polkadot relay chain since it doesn't understand other assets than DOT.

Change the reserve chain for DOT from Polkadot relay chain to Polkadot AssetHub.
Schedule the runtime upgrade to happen at some fixed point in time later (with enactment at least 3 days)
Transfer all of the Hydration parachain DOT from the Relaychain to Hydration parachain account on AH at the scheduled flippening time. (we will need to sync these events as close as possible)

Inform

• make a public post this will happen at least a week - 2 upfront and then post more when the date is closing in @lolmcshizz
• nova wallet
• talisman
• subwallet
• paraspell
• our sdk @nohaapav
• xcm sdks? @green-jay
• other wallets? @green-jay

[mrq1911]

2 runtime upgrades and 2 extra referenda to move funds

1. transfer 1/2 to AH
2. make asset hub reserve chain
3. grace period for UI’s and integrations to start using AH
   - optionally rebalance reserves if necessary
4. remove polkadot as a reserve
5. move rest to AH

[green-jay]

1. transfer 1/2 to AH - calldata
   0x6b0003010003140004000000000700e40b540213000000000700e40b540200060102286bee020004000101630b03000100a10f03000101007369626cf20700000000000000000000000000000000000000000000000000000304000000000f0080d5cd60b6510000000000140d0102040001010070617261f2070000000000000000000000000000000000000000000000000000

[dmoka]

PR to make AH DOT reserve: #896

[dmoka]

When we do the flippening and change the location of DOT in our asset registry, we also need to change it in code:

hydration-node/runtime/hydradx/src/assets.rs

Line 777 in eddc67f

pub const DOT_ASSET_LOCATION: AssetLocation = AssetLocation(polkadot_xcm::v3::MultiLocation::parent());