Need to add license info to top of CAM-SIMA source files

### Issue Type

Documentation Update

### Issue Description

There is a legal requirement to have a comment header in each source code file that displays the software license information, specifically a comment block that looks like the following:

```
! Copyright (C) 2024 National Science Foundation-National Center for Atmospheric Research
! SPDX-License-Identifier: Apache-2.0
```

Thus it would be good to go through the CAM-SIMA source code and ensure that this header is present for all source files.

### Will this change answers?

No

### Will you be implementing this yourself?

Any Software Engineer can do this