feat(rust-plugins): add --check-format argument

[scresto31]

Description

Add --check-format argument to check JSON validity

Fixes # CTOR-2210

Type of change

• Patch fixing an issue (non-breaking change)
• New functionality (non-breaking change)
• Functionality enhancement or optimization (non-breaking change)
• Breaking change (patch or feature) that might cause side effects breaking part of the Software

Summary by Aikido

Security Issues: 0	🔍 Quality Issues: 1	Resolved Issues: 0

🚀 New Features

• Added --check-format mode to validate JSON and macro usage.

⚡ Enhancements

• Extended CLI parsing to store thresholds, help, and json file.
• Updated default OK output message to a Nagios-style string.

🔧 Refactors

• Refactored Parser API and evaluation errors to support validation.

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