Fix typo in generators copier.yaml to be able to execute the copier task that informs about successful execution

[aorumbayev]

Current copier yaml on smart contract generator has a typo for tasks definition, _task, but should be _tasks instead.

Somehow this went unnoticed during the initial release of that generator, most likely due to the fact that this task was simple echo and the actual copying behavior worked as expected.

In order to fix it we need to add a few additional handlers into cli repo itself given that (i believe enforced from v9.x of copier) running copy task on any copier yaml with _tasks defined will fail by default, you need to pass --trust flag. Instead prior to running copier cli would need to parse the copier answers file, parse the repo from where it was loaded compare it against blessed templates and then depending on whether its a generator coming from official repo or not it will:

1. If its official, execute the task as is
2. If not, execute the task but only if user approves a manual popup that explicitly states that the generator being executed is not official so user must proceed with caution (also adding --trust flag can aid supressing this popup)

[aorumbayev]

@iskysun96 just fyi, this is fixed in #50 and accompanied by algorandfoundation/algokit-cli#366