feat(permit): load pre generated permit info

[alfetopito]

Summary

Part of cowprotocol/token-lists#293

Depends on cowprotocol/token-lists#299

Use the pre-generated permit info data.

1. When checking whether the token is permittable, check first on the pre-generated data

• Only when that's not available, check the token is permittable locally

2. In the token selector, use a combination of pre-generated data and locally fetched permit info

• With that info, show the flag in the dropdown selector

To Test

1. Open the token selector

• There should be tokens with the gas free flag

2. Pick a permittable token you don't have allowance for
3. Check the network tab and filter for PermitInfo

• There should be a request for PermitInfo.<chain id>.json for the current network you are on
• Switching to different tokens, to another tab, switching to a different window should NOT trigger a new request of this file

4. Place order

• Should pop up to sign permit
• Order appData should contain permit pre hook

5. Load another token that's permittable and is not in the list, such as 0x30d20208d987713f46dfd34ef128bb16c404d10f (SD) on mainnet
6. Pick it as a sell token

• Permit info for it should be loaded and stored on permittableTokens:v1 localStorage

7. Open the token selector and search for the token that was just added

• Should have the gas free flag.

6. Swap it

• Should work like the one from the list

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[alfetopito]

Waiting on cowprotocol/token-lists#299 to be merged

[anxolin]

Beautiful ❤️, nice to see how all fits together: new token modal, script, permit check, library etc