EVM: Add support for token split via DST20 v2 contract

[Jouzo]

Summary

• Introduces new DST20 v2 contract which updates the EVM token split mechanism such as :

  • Removes the need for intrinsic v2
  • Upgrades the DST20 contract to implement ITokenSplit interface which contains both SplitResult event and split method
  • Injects the new amount on the old contract instead of the message sender, which lets us send the token from the old contract to the message sender.
  • Goes through the DST20(newContract).transfer method to trigger a transfer event. This should now be correctly picked up by blockscout as a token transfer from the old contract to the message sender of the new amount of the new token

• Deploy new DST20 version on fork height df23 by updating the implementation slot

• Clean up of DST20 contract free functions in dedicated file and introduce contract directory

[Jouzo]

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