add Argo revert_outbound_transfer extrinsic

[kdembler]

Based on #5155

Adds a new revert_outbound_transfer extrinsic. Functionally, the new extrinsic is almost the same as finalize_inbound_transfer:

1. It verifies that the caller is the operator
2. It checks mint allowance
3. It mints new tokens

4. The only difference is in input arguments and the emitted event.

Todo:

• [ ] Add proper benchmarks and weights

[kdembler]

@freakstatic if you could do that, that'd be great