Added Form Field Dependencies Manager

[poojithavalli22]

PR Description:

Adds a reusable Form Field Dependencies Manager for ServiceNow Catalog Items to centralize and simplify complex form logic. The manager supports cascading updates, conditional visibility, dynamic mandatory rules, value mappings, and dependency chain logging. Includes configuration examples and a README with usage, troubleshooting, and best practices.

Pull Request Checklist

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[ravichandra1998g]

looks good to me.

[ravichandra1998g]

Hello @poojithavalli22

looks like you have submitted multiple PRs with incorrect syntax.

Please make sure to submit the use cases with correct syntax as the PRs could potentially be marked as SPAM.