### Check existing issues - [x] I've verified that this request isn't described by any existing issues. ### Request Replace the current [`init` command](https://github.com/canonical/charmcraft/blob/main/charmcraft/application/commands/init.py) in Charmcraft with the [craft-application `init` command](https://github.com/canonical/craft-application/blob/main/craft_application/commands/init.py), extending the craft-application command and the [InitService](https://github.com/canonical/craft-application/blob/main/craft_application/services/init.py) to make this possible. ### The problem it solves * All existing args must be accepted. However: * The `--author` argument (and the general GECOS info) is no longer used and may simply output a warning that it’s not used. * `--force` can similarly be replaced with a warning. (The craft-application behaviour of initing a project even if files exist in this directory as long as they’re not overwritten is acceptable as the default, so the behaviour of `--force` becomes the default behaviour) * The command must accept either the positional `project_dir` as in craft-application or `--project-dir` as in existing charmcraft, with a migration note for users. * `--project-dir` should be removed from the help and documentation * Extend the craft-application InitService to be able to rename template files, similar to how it’s implemented in [https://github.com/canonical/charmcraft/pull/2242](https://github.com/canonical/charmcraft/pull/2242) * This should include at least one `testcraft` spread test that uses this feature. * End-to-end tests in Charmcraft pass without changes Supersedes #2316