ERC-7621 Basket Token

🆔 ERC-165 interface ids

Computed here as the XOR of the selectors each interface defines.

IERC7621 0xc9c80f73

`0xa1ee8feb`	`contribute(uint256[],address,uint256)`
`0x10d79f4d`	`getConstituents()`	view
`0xc9a396e9`	`getReserve(address)`	view
`0xac6c5251`	`getWeight(address)`	view
`0x6a76d37b`	`isConstituent(address)`	view
`0xd1602deb`	`previewContribute(uint256[])`	view
`0x0a28a477`	`previewWithdraw(uint256)`	view
`0x2be01190`	`rebalance(address[],uint256[])`
`0x28b50621`	`totalBasketValue()`	view
`0x1f39b64e`	`totalConstituents()`	view
`0xb06c2075`	`withdraw(uint256,address,uint256[])`