Support Disputable Forwarding Path

[0xGabi]

Description

Support transaction paths as mentioned in the Agreement spec.

On a conceptual level, the current transaction pathing algorithm should be able to find transaction paths with a disputable app at the beginning. This path should even be executable if the Agreement and Disputable have been configured to not require any collateral/fees.

Approach

We should use the latest deployed organization to try sending an app intent. Currently, the org's permissions allow for Finance and Agent transfers to happen via a disputable vote.

• Decide if any API changes are required
  • Theoretically, a user can figure out that the path we gave them is disputable

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The API currently do not work because the forward() API has changed.

DisputableVoting's forward now includes an extra parameter in its forward() function: https://github.com/aragon/aragon-apps/blob/disputable_voting_app/apps/voting-disputable/contracts/DisputableVoting.sol#L236

We can detect which forwarding version is implemented via forwarderType(): https://github.com/aragon/aragonOS/blob/next/contracts/forwarding/IAbstractForwarder.sol#L16-L20

Which should be checked after verifying isForwarder().