feat(misconf): scanning support for YAML and JSON

[nikpivkin]

Description

This PR adds the ability to scan arbitrary YAML or JSON files. See documentation.

Changes:

• Enable scanning of YAML and JSON files.
• Disable YAML and JSON scanners by default, as Trivy does not have built-in checks for configuration files of this type.
• Add config-file-schemas flag for filtering JSON and YAML files and type checking in Rego checks.

Usage:
trivy config --misconfig-scanners=json,yaml --config-check ./serverless.rego --check-namespaces user --config-file-schemas ./serverless-schema.json ./iac

Related issues

• Close feat(misconf): Support arbitrary file types with custom schema #7158

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).