fix: support multiple values for list fields in setup_config command

[srijan2607]

This pull request enhances the parsing logic for list values in the setup_config management command, making it more robust and user-friendly when handling complex list inputs. The main improvements are the introduction of a dedicated parser for comma-separated lists with support for quoted strings, and clearer documentation/examples for end users.

Parsing and Input Handling Improvements:

• Added a new _parse_list_values function that accurately parses comma-separated list values, supporting single-quoted, double-quoted, and unquoted items, and gracefully handling values with spaces or mixed quoting styles.
• Updated parse_field_value to use _parse_list_values for list fields, ensuring consistent and correct parsing of complex list inputs.

Documentation and Usability:

• Expanded and clarified the command-line usage examples in the create_parser docstring, demonstrating how to override, append, or remove multiple values (including those with spaces) from list fields, and emphasizing the need for quoting in such cases.

Code Maintenance:

• Added the missing re import and updated type hints to include List, preparing the code for the new parsing logic.

---

Related issues : #499

[srijan2607]

@Lorygold can you take a look

[Lorygold]

@Lorygold can you take a look

Could you please add some tests in the test_management_command.py file, please?

[srijan2607]

@Lorygold take a look

[srijan2607]

@Lorygold can you please update this

[Lorygold]

@srijan2607 please check if the doc of this command has to be updated, with the correct possible command string here (without AI, please)

[Lorygold]

@srijan2607 could you please update the doc related to this django command?