Add JSON Support to RECmd Batch

[reece394]

Description

As requested by @AndrewRathbun and @philhagen implemented JSON support to RECmd Batch. This follows the JSONL format similar to the pull request I did for SQLECmd. I did the minimum amount of changes required to allow this to function.

Similar to SQLECmd I have allowed null values to be output as I feel it is important to surface the field names to let the analyst know the tool didn't output a value for a specific field but open to change this if you want null values hidden.

Kept the format the same where the plugins output to a separate folder to avoid clogging up the main batch file but these files also output to JSON as well.

[Copilot]

Pull Request Overview

This PR adds JSON output support to RECmd's batch mode functionality, allowing users to output results in JSONL format as an alternative to CSV. The implementation follows a similar pattern to the SQLECmd JSON support, with both main batch output and plugin output capabilities.

• Adds JSON command-line options and validation logic for batch mode
• Implements JSONL output for both main batch results and plugin-specific data
• Updates method signatures throughout the codebase to support JSON parameters

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