Propose and approve a spend of treasury funds.

## Dispatch Origin

Must be [`Config::SpendOrigin`] with the `Success` value being at least
`amount` of `asset_kind` in the native asset. The amount of `asset_kind` is converted
for assertion using the [`Config::BalanceConverter`].

## Details

Create an approved spend for transferring a specific `amount` of `asset_kind` to a
designated beneficiary. The spend must be claimed using the `payout` dispatchable within
the [`Config::PayoutPeriod`].

### Parameters
- `asset_kind`: An indicator of the specific asset class to be spent.
- `amount`: The amount to be transferred from the treasury to the `beneficiary`.
- `beneficiary`: The beneficiary of the spend.
- `valid_from`: The block number from which the spend can be claimed. It can refer to
  the past if the resulting spend has not yet expired according to the
  [`Config::PayoutPeriod`]. If `None`, the spend can be claimed immediately after
  approval.

## Events

Emits [`Event::AssetSpendApproved`] if successful.

- **Problem Statement:** Developing a Polkadot Humanoid Robot SDK at Cyberpunk Lab to address the need for decentralized technologies in humanoid robotics.
- **Significance:** Humanoid robots are projected to outnumber humans soon, with a $24 trillion market opportunity, but current reliance on centralized clouds poses risks. Decentralized systems can enhance communication, security, and scalability for robots.
- **Proposed Solution:** Establishing a cutting-edge research lab to create a Polkadot Humanoid Robot SDK that integrates humanoid robots with Polkadot Cloud, showcasing Polkadot's technological capabilities.
- **Expected Outcomes:** Showcasing Polkadot's range, driving network utility, expanding the developer community, strengthening decentralization and security for IoT/robotics, and exemplifying open governance through the Cyberpunk Lab initiative.

#1523 Developing Polkadot Humanoid Robot SDK at Cyberpunk Lab

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