Add Silverfort Identity Security integration

[FrankGasparovic]

Description

Please provide a detailed description of your changes. This helps reviewers understand your work and its context.

What problem does this PR solve?

This PR adds a new community integration for Silverfort Identity Security, enabling Google SecOps SOAR users to interact with Silverfort's identity protection platform. The integration provides capabilities for:

• Risk Management: Get and update entity risk scores for users and resources
• Service Account Protection: List, retrieve, and configure protection policies for service accounts
• Authentication Policy Management: Create, update, enable/disable authentication policies

How does this PR solve the problem?

Added a complete integration under content/response_integrations/third_party/community/silverfort/ with:

• 11 Actions:

  • Ping - Test connectivity to Silverfort API
  • Get Entity Risk - Retrieve risk information for users/resources
  • Update Entity Risk - Set risk levels based on external threat intelligence
  • Get Service Account - Get detailed service account information
  • List Service Accounts - List all service accounts with pagination
  • Update SA Policy - Configure service account protection policies
  • Get Policy - Retrieve authentication policy details
  • List Policies - List all authentication policies
  • Update Policy - Modify policy settings
  • Change Policy State - Enable/disable policies

• Core Components:

  • JWT-based authentication with automatic token refresh
  • Separate API clients for Risk, Service Account, and Policy APIs
  • Comprehensive data models using Python dataclasses
  • Custom exception handling

• Tests:

  • 16 unit tests covering all actions
  • Mock infrastructure for API responses
  • Standard import test (test_defaults/test_imports.py)

Any other relevant information (e.g., design choices, tradeoffs, known issues):

• The integration supports multiple API credentials (Risk API, Service Accounts API, Policies API) configured separately in the integration settings
• Uses slots=True for dataclasses for memory efficiency
• All tests pass and validation completes successfully
• Follows the same patterns as other community integrations (e.g., grey_noise, vectra_rux)

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Checklist:

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General Checks:

• I have read and followed the project's contributing.md guide.
• My code follows the project's coding style guidelines.
• I have performed a self-review of my own code.
• My changes do not introduce any new warnings.
• My changes pass all existing tests.
• I have added new tests where appropriate to cover my changes. (If applicable)
• I have updated the documentation where necessary (e.g., README, API docs). (If applicable)

Open-Source Specific Checks:

• My changes do not introduce any Personally Identifiable Information (PII) or sensitive customer data.
• My changes do not expose any internal-only code examples, configurations, or URLs.
• All code examples, comments, and messages are generic and suitable for a public repository.
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• I have included the Buganizer ID in the PR title or description (e.g., "Internal Buganizer ID: 123456789" or "Related Buganizer: go/buganizer/123456789").
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• I have tagged the PR with one or more labels that reflect the pull request purpose.

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Screenshots (If Applicable)

N/A - Backend integration only, no UI changes.

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Further Comments / Questions

• Validation Results: All 16 tests pass, mp validate --integration silverfort completes successfully
• Build Output: Integration builds correctly with mp build --integration silverfort
• Dependencies: Uses standard dependencies (requests, PyJWT) already available in the SOAR environment

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