Previous discussion: [https://kusama.polkassembly.io/post/1606](https://kusama.polkassembly.io/post/1606)

Approve a proposal. At a later time, the proposal will be allocated to the beneficiary
and the original deposit will be returned.

May only be called from `T::ApproveOrigin`.

# <weight>
- Complexity: O(1).
- DbReads: `Proposals`, `Approvals`
- DbWrite: `Approvals`
# </weight>

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#503 Treasury propoal: KSM initial liquidity subsidy for KSM staking liquidity derivative - vKSM