[FSSDK-12080] prepare release 6.3.0

[raju-opti]

Issues

• FSSDK-12080

[Copilot]

Pull Request Overview

This PR prepares the Optimizely JavaScript SDK for the 6.3.0 release by updating version numbers across the codebase and documenting the changes in the CHANGELOG.

Key Changes:

• Version bumped from 6.2.0 to 6.3.0 across all package files and code constants
• CHANGELOG updated with comprehensive release notes for version 6.3.0, including new features (Holdouts support, configurable prediction endpoint, HTTP support, TTL for events, maxRetries option, custom headers), changes (CMAB exclusion from user profile service), and bug fixes (ODP logging)
• Test expectations updated to reflect the new version number

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
package.json	Updated package version from 6.2.0 to 6.3.0
package-lock.json	Updated lockfile version references to 6.3.0 in both root and packages sections
lib/utils/enums/index.ts	Updated CLIENT_VERSION constant from 6.2.0 to 6.3.0
lib/index.react_native.spec.ts	Updated test expectation for clientVersion to 6.3.0
lib/index.node.tests.js	Updated test assertion for clientVersion to 6.3.0
lib/index.browser.tests.js	Updated test assertion for clientVersion to 6.3.0
CHANGELOG.md	Added comprehensive release notes for version 6.3.0 with new features, changes, and bug fixes

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