DNM: PoC for SwapAssetAdapter to use hold and release pattern

[athei]

We don't want to merge it yet. Just to show how it will work and that it passes all tests. Building on #9590

For accounts that only hold a sufficient asset but no native balance we need to get creative: We increase the pre dispatch fee by the ed. This is because even when increasing the providers of an account, dusting will still happen when an account is below ed. Hence we need to make sure that in addition to the actual fee there is at least the ed inside the hold. Pallet's wont touch the ed as long as they use KeepAlive when transferring from the hold.

[paritytech-workflow-stopper]

All GitHub workflows were cancelled due to failure one of the required jobs.
Failed workflow url: https://github.com/paritytech/polkadot-sdk/actions/runs/17491163502
Failed job name: test-linux-stable-no-try-runtime

[paritytech-workflow-stopper]

All GitHub workflows were cancelled due to failure one of the required jobs.
Failed workflow url: https://github.com/paritytech/polkadot-sdk/actions/runs/17491163502
Failed job name: test-linux-stable

[acatangiu]

Didn't review the implementation, but all tests are passing so we know it works! 👍

[athei]

Yeah it works in general. It is more of a soft failure: Transactions might pre-charge an additional ed. But on parachains this is very cheap. So hopefully not an issue in practice. Talking about additional cents you need in your wallet to send a tx.

[athei]

The hold and release pattern didn't work out. We switched to a simpler model not requiring holds: #9780