AVN: Fork to a different project

[dcop7]

What is currently missing?

Using the AVN cli, we can't fork and restore to a different project.
Using terraform we can define "project_to_fork_from" (https://github.com/aiven/terraform-provider-aiven/blob/6e03b376f407123d49299b82482981debc5e903d/docs/resources/pg.md?plain=1#L157), but no option exist using AVN cli.

How could this be improved?

Adding the option project_to_fork_from in AVN cli.
Something like this:
avn service create SERVICE_NAME --project PROJECT_NAME --service-type SERVICE_TYPE --cloud CLOUD_NAME --project-to-fork-from PROJECT_TO_FORK_FROM --service-to-fork-from SERVICE_TO_FORK_FOM --plan SERVICE_PLAN

So, add:
--project-to-fork-from PROJECT_TO_FORK_FROM