EthAssetManager and ThreePoolAssetManager don't control Meta tokens decimals

EthAssetManager and ThreePoolAssetManager lack control over Meta tokens decimal, impacting minting and slippage logic. Vulnerability details show how the minting logic breaks if meta tokens have decimals different from 18. This leads to fund losses and the inability to mint. The impact is system-breaking, conditional on a low probability assumption of different meta token decimals. Recommended mitigation steps involve controlling the decimals in the constructors