(this is a resubmission after Ref 708 failed due to a technical reason)

The Polkadot Fellowship has introduced a new `spend()` extrinsic.

This proposal aims to raise awareness about the new features it supports and to test it out by tipping Alice und Bob 69 USDT on AssetHub.

The new `spend()` extrinsic has been introduced with the Polkadot Runtime 1.1 upgrade. It supports:
- multi-asset Treasury spends, e.g. DOT, USDT, USDC, etc...
- from an XCM multi-location, e.g. AssetHub
- to be paid out at a specific block

This new extrinsic makes a lot of things possible:
- instant payments instead of waiting a spend cycle of up to 24 days
- paying proposers in USD stables to remove exchange rate risk
- setting up a payment plan of monthly payouts by batching multiple spends at estimated block heights
  - and even canceling scheduled payments

This proposal is based on the information provided in [this forum post](https://forum.polkadot.network/t/multi-asset-treasury-and-milestone-based-spends/6780) and [this instructional guide](https://docs.google.com/document/d/1rq10o43E1jc-m6tEh2zvVDxjijsT775II81oYr2oyws/edit). It is intended to test if the extrinsic works as described. During the test, it was already discovered that the instructions are not exactly correct, as Polkadot.js tries to help the user by having value fields taking "DOT" values that add 10 decimals under the hood, which interferes with the GeneralIndex field of the assetKind location and the amount field. A wrongful [proposal 707](https://polkadot.subsquare.io/referenda/707) was the result. This proposal should have corrected values. But further errors might be possible since this was never before tested in production.

I suggest sending 69 USDT because it's a funny number and it's related to Bitcoin

The call works as follows

The V3 AssetKind contains a V3 MultiLocation pointing to Parachain 1000 -> AssetHub. The AssetID is a relative location inside AssetHub pointing to PalletInstance 50 -> assets, GeneralIndex 1984 -> USDT
![image.png](https://subsquare.infura-ipfs.io/ipfs/QmNRZ6ybDT1PabJuS6k9VijFAxdSCDmkfqXLgHk6b2p8pu)

The amount is 69_000_000 (USDT is denominated with 6 decimals)
![image.png](https://subsquare.infura-ipfs.io/ipfs/QmWXNh5FzNxiGkP1GPkqKitwp4JEtoZH3x8LAGECbU6sQ2)

The beneficiary is Polkalytics, the company account of Alice und Bob
![image.png](https://subsquare.infura-ipfs.io/ipfs/QmWUTTPEdrXUDAemSYi6qvUUX8j44SM6ih8VXiPd2bCTrM)

- **Problem Statement:** Introducing the new `spend()` extrinsic by the Polkadot Fellowship to test its functionality by tipping Alice and Bob 69 USDT on AssetHub.
- **Significance:** Testing the new extrinsic allows for instant payments, reduces exchange rate risks, enables setting up payment plans, and canceling scheduled payments.
- **Proposed Solution:** Utilizing the new `spend()` extrinsic introduced with the Polkadot Runtime 1.1 upgrade to facilitate multi-asset Treasury spends from XCM multi-locations to specific blocks.
- **Expected Outcomes:** Testing the extrinsic's functionality and correcting any errors to ensure accurate and efficient multi-asset Treasury spends.

#756 Test the brand-new spend() extrinsic (resubmission of 708)

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