Feature request: Allow user to set app name in Modal deployment

[undfined]

Summary

When using swe-rex as a sandbox orchestration layer within another library users may want to set the Modal app name for further isolation and their sandboxes. Right now this is hardcoded to "swe-rex" and is not exposed to the caller. The request is to expose an "app_name" argument so that callers can override the default app name when deploying to Modal.

Source: https://github.com/SWE-agent/SWE-ReX/blob/v1.4.0/src/swerex/deployment/modal.py#L145