fix: rebase PR #84 - SmsGatewayHub SMS adapter

[deepshekhardas]

Replacement for #84. Original by @kevinjosephjohn.

Rebased on latest main. Fixed:

• Added parent::__construct() call
• Made properties private readonly
• Removed error_log debugging calls
• Fixed test to use env vars with skippable check
• Aligned with v2.0.0 conventions

[github-actions]

Thanks for contributing! This repository is a read-only mirror; development for this library happens in packages/messaging in the utopia-php monorepo. Please open this pull request there instead.

[greptile-apps]

Greptile Summary

Adds an SMSGatewayHub adapter and its credential-gated integration test.

• Builds SMSGatewayHub GET requests with configured routing and DLT parameters.
• Normalizes and batches up to 100 recipients.
• Converts transport outcomes into the standard messaging response format.
• Skips the live integration test when required environment variables are unavailable.

Confidence Score: 5/5

The pull request appears safe to merge, with no concrete actionable defects identified in the changed code.

The adapter follows the repository’s established SMS lifecycle and response conventions, while the available evidence does not establish a reachable provider-contract or runtime failure.

Important Files Changed

Filename	Overview
src/Utopia/Messaging/Adapter/SMS/SmsGatewayHub.php	Adds the provider adapter with request construction, recipient normalization, batching, and standard response mapping; no concrete changed-code defect was established.
tests/Messaging/Adapter/SMS/SmsGatewayHubTest.php	Adds a skippable environment-backed integration test for successful SMS delivery.

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