Add option to disable Unicode escaping of characters like `&`

When merging SBOMs using the CycloneDX CLI, characters like `&` are currently encoded as Unicode escape sequences (`\u0026`) in the resulting JSON output, even though this is not required by the JSON specification.

### Problem
Printable characters such as the ampersand (`&`) are unnecessarily escaped in the generated JSON:
```json
"author": "ACME R\u0026D Team"
```
This reduces readability and creates noisy diffs in version control, even though these characters are perfectly valid in JSON when unescaped.

### Feature Request
Please consider adding a CLI option such as `--no-ascii-escape` or `--preserve-utf8` that outputs characters like `&` as-is, without escaping them to Unicode:
```json
"author": "ACME R&D Team"
```
### Benefits
- Improves human readability of SBOM files
- Reduces unnecessary changes in version control
- Matches behavior of other JSON serializers like Python's `json.dump(..., ensure_ascii=False)
`