[Feature Request]: Allow registration of SHS devices in bulk

### Preflight Checklist

- [x] I have read the [Contributing Guidelines](https://github.com/EnAccess/micropowermanager/blob/main/CONTRIBUTING.md) for this project, if it exists.
- [x] I agree to follow the [Code of Conduct](https://github.com/EnAccess/micropowermanager/blob/main/CODE_OF_CONDUCT.md) that this project adheres to.
- [x] I have searched the [issue tracker](https://github.com/EnAccess/micropowermanager/issues) for a feature request that matches the one I want to file, without success.

### Problem Description

Currently, when user need to register SHS devices with MPM, they have to register devices 1-by-1.

While this works for small device numbers, it's cumbersome and not scalable to larger use-cases.

### Proposed Solution

As an intermediate solution, please implement a very basic approach to overcome the above mentioned challenge:

Change the "Serial Number" field of the add SHS model to allow multiple values, as comma separated list

Make sure, that users can copy/paste a comma separated list and the UI converts that into chips like so

### Alternatives Considered

An alternative we could explore the option to provide a CSV upload. This might be technically complex as we need to consider things like error handling, notifications and async processing.

### Additional Information

_No response_