Add storage migrations for substrate 0.9.38

[vovac12]

We need to find all needed storage migrations from 0.9.25 to 0.9.31 and add it

[vovac12]

Important notes from paritytech/substrate#11649

There is migration code which moves existing proposals and referenda over to the new format. However IT DOES NOT MIGRATE EVERYTHING:

• Preimages are NOT migrated. Any registered preimages in Democracy at the time of migration are dropped. Their balance is NOT UNRESERVED.
• The re-dispatcher used in the old Democracy implementation is removed. Any proposals scheduled for dispatch by Democracy WILL NOT EXECUTE.

This means you SHOULD ensure that:

• the preimage for the runtime upgrade is placed as an imminent preimage, not with a deposit;
• no other preimages are in place at the time of upgrade;
• there are no other proposals scheduled for dispatch by Democracy at the time of upgrade.

The Democracy pallet will be marked as deprecated immediately once Referenda is considered production-ready. ALL TEAMS ARE RECOMMENDED TO SWITCH SWAY FROM DEMOCRACY PALLET TO REFERENDA/CONVICTION-VOTING PALLETS ASAP