feat: add OptimismFiatTokenV2_2
for compatibility with IOptimismMintableERC20
#451
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Context:
For normal ERC20 tokens we could use Optimism's ERC20 factory, but for USDC we need to follow the Bridged USDC Standard in order to have the option to eventually migrate the contract to a native Circle issued USDC, instead of ending up with two USDC variants on the L2.