feat(DATAGO-131375): Implement EventMeshService for request-response communication via Solace broker

[cyrus2281]

What is the purpose of this change?

This plugin provides a generic, vendor-agnostic identity and employee service provider for Solace Agent Mesh that communicates with backend systems via the Solace event broker using request-response messaging. It eliminates the need for custom code when integrating with HR or identity systems.

How was this change implemented?

High-level approach:
- Created a new plugin that implements both BaseIdentityService and BaseEmployeeService interfaces
- Built an EventMeshService class for Solace request-response communication
- Added a configurable field mapping engine to transform backend data into canonical format
- Implemented support for all identity and employee service operations
- Added comprehensive test coverage for all components
- feat: Implement EventMeshService for request-response communication via Solace broker

Key Design Decisions

Rather than creating separate plugins for different backend systems (Workday, BambooHR, etc.), this plugin provides a single configurable solution that works with any backend. Configurable topics and field mappings allow users to adapt to their specific backend systems without modifying code, while the caching layer improves performance.

How was this change tested?

• Manual testing: Verified request-response flow with Solace broker
• Unit tests: Added comprehensive tests for all components (field_mapper, provider, service)
• Integration tests: Not applicable at this stage
• Known limitations: Real-world integration testing with specific HR systems will be needed

Is there anything the reviewers should focus on/be aware of?

The plugin can be used in two roles: as an identity service for gateway identity enrichment, and as a people/employee service for agent employee queries. Operations can be selectively enabled.

[sonarqube-solacecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
97.3% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube

[github-actions]

✅ SonarQube Quality Gate - All Passed

Project	Quality Gate Status	Analysis
sam-event-mesh-identity-provider	✅ Passed	See analysis details on SonarQube

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Quality gate checks run for each changed project.

[github-actions]

✅ FOSSA Guard (PR Diff) - No New Issues Introduced

Diff mode compares PR head against base revision and reports only newly introduced issues.

Check	Scope	Status
FOSSA Vulnerabilities	Per-Project (PR Diff)	✅ Passed
License Check	Per-Project (PR Diff)	✅ Passed

Projects With New Issues

• None

Project	FOSSA Vulnerabilities	License Check	FOSSA Report
sam-event-mesh-identity-provider	✅ Passed	✅ Passed	View report

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Only newly introduced issues are shown in this report.

[artyom-morozov]

👍