chore: update changelog for alpha release

[mattjohnsonpint]

Updating the changelog for the next set of alpha releases of v0.18.0

[trunk-io]

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[Copilot]

Pull Request Overview

Updating the changelog for the upcoming v0.18.0 alpha releases:

• Promote Go SDK to 0.18.0-alpha.3 with the new parsing feature and fix
• Publish AssemblyScript SDK and Runtime at 0.18.0-alpha.2 with their respective changes

Comments suppressed due to low confidence (3)

CHANGELOG.md:10

• The date for the AssemblyScript SDK 0.18.0-alpha.2 section may not match its original release—consider using 2025-05-19 to align with alpha.2 or bump the version to alpha.3 if it’s a new 05-22 release.

## 2025-05-22 - AssemblyScript SDK 0.18.0-alpha.2

CHANGELOG.md:5

• [nitpick] The parsing feature (#853) appears under both Go SDK and AssemblyScript SDK—consider clarifying in each section if it’s implemented differently or grouping cross-SDK features under a shared header.

## 2025-05-22 - Go SDK 0.18.0-alpha.3

CHANGELOG.md:15

• Runtime 0.18.0-alpha.2 is dated the same as the Go alpha.3 release—verify whether this should be an alpha.3 bump or adjust the date to reflect the actual alpha.2 rollout.

## 2025-05-22 - Runtime 0.18.0-alpha.2