Compare with Uniswap and 1inch solutions

[frangio]

We have to make sure all the same tokens are supported.

• https://github.com/Uniswap/interface/blob/main/src/hooks/useERC20Permit.ts#L34-L44
• https://github.com/1inch/permit-signed-approvals-utils/blob/master/src/eip-2612-permit.const.ts