Update Changelog for 0.2.0

[Tejashree-RS]

Summary

Updates the Changelog entry for the DTC (DNS Traffic Control) feature to list the specific components covered instead of generic CRUD operation descriptions, and adds the missing SNMP health check type.

Type of Change

• 🆕 New API / Model
• 🔧 Update Existing Schema or Model
• 🐛 Bug Fix
• 📝 Documentation
• 🧹 Maintenance (dependency upgrades, CI, refactoring)

Affected Packages

• anycast
• cloud_discovery
• dfp
• dns_config
• dns_data
• dtc
• fw
• infra_mgmt
• infra_provision
• ipam
• ipam_federation
• keys
• redirect
• upgrade_policy
• universal_ddi_client

Resource / Model: DTC (DNS Traffic Control)
Description: Changelog.md updated to list DTC Server, DTC Pool, DTC Policy, DTC HTTP/ICMP/TCP/SNMP/PDP/SIP Health Checks, and DTC Topology as the features covered by the DTC support added in PRs #30 and #38.

Schema Changes

• New model added
• New field(s) added to existing model
• Field(s) removed or renamed
• Required fields changed

Ticket / Issue

Fixes #

Changelog Inclusion

• Consider for changelog and release notes addition

Additional Context

Documentation-only change to Changelog.md for the 0.2.0 release; no code changes.

[AnilGadiyarHJ]

LGTM