[FSSDK-11874] Release v2.2.0

[Mat001]

Summary

Release v2.2.0 with CMAB (Contextual Multi-Armed Bandit) support and multi-region data hosting.

New Features

• CMAB (Contextual Multi-Armed Bandit) Support: Added comprehensive support for CMAB experiments, enabling dynamic optimization based on user context and real-time learning
• Multi-Region Data Hosting Support: Added SDK support for multi-region data hosting to improve performance and comply with data residency requirements

Public API Changes

CMAB-Related Changes

• New CMAB Package (pkg/cmab):
  • Service interface for CMAB decision services
  • Client interface for CMAB API clients
  • Decision struct for CMAB decision results
  • Config struct for CMAB configuration options
  • NewDefaultConfig() function for default CMAB configuration
• Client Factory: WithCmabConfig(*cmab.Config) OptionFunc - New option for setting CMAB configuration
• Event Metadata: CmabUUID field added to DecisionMetadata for CMAB tracking

Multi-Region and Notification Changes

• Project Config Interface: GetRegion() string method for multi-region support
• Event Structures: Region field added to event structures
• Multi-Region Support: SupportedRegions map exported in event package with region-based endpoint selection
• Enhanced Decision Notifications: Decision notification listener payload now includes:
  • experimentId field for experiment identification
  • variationId field for variation identification

Files Changed

• pkg/event/version.go: Updated version from 2.1.0 to 2.2.0
• CHANGELOG.MD: Added 2.2.0 release notes

Next Steps

After approval and merge:

1. Create GitHub release with tag v2.2.0
2. Copy changelog content to release description

Jira ticket:
https://jira.sso.episerver.net/browse/FSSDK-11874

[Copilot]

Pull Request Overview

Release version 2.2.0 with CMAB (Contextual Multi-Armed Bandit) support and multi-region data hosting capabilities.

Key Changes

• Version bump from 2.1.0 to 2.2.0
• Comprehensive changelog documenting new CMAB features and multi-region support
• Public API additions including new CMAB package, client factory options, and enhanced event structures

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pkg/event/version.go	Updates version constant to reflect 2.2.0 release
CHANGELOG.MD	Adds detailed release notes for version 2.2.0 with feature descriptions and API changes

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