Consider adding `GTF_OUTPUT_VARIABLE_AMOUNT` and `GTF_OUTPUT_CHANGE_AMOUNT` fields to `gtf`

[mohammadfawaz]

Consider adding GTF_OUTPUT_VARIABLE_AMOUNT and GTF_OUTPUT_CHANGE_AMOUNT fields to gtf. A field for OutputChange may be redundant because the value is always 0, but it's worth considering adding it just for completeness.

[Voxelot]

cc @vlopes11

[pixelcircuits]

It could also be helpful to include an _AMOUNT, _ASSET_ID and _TO for OutputChange and OutputVariable for completeness. The bridge predicate already has a use case to check for GTF_OUTPUT_CHANGE_ASSET_ID

[Voxelot]

Given change amounts are only set post-execution, I'm not sure if there's a real use case for GTF_OUTPUT_CHANGE_AMOUNT.

[xgreenx]

I think it is better not to support useless GTF, because it only increases the codebase burden and adds confusion to the user, which expects an actual value.

If we still want to do that, then we can reopen this issue and continue discussion again