Create SocketlabsAdapter.php

[adarsh-jha-dev]

What does this PR do?

This PR introduces a new messaging adapter to enable email notifications through the Socketlabs API within the Utopia PHP messaging library.

##Changes Made:

• Created a new directory 'Socketlabs' within the 'adapters' folder.
• Implemented the SocketlabsAdapter.php class, which adheres to the MessagingAdapterInterface interface.
• Added methods for setting configuration variables, such as API keys and API endpoints.
• Implemented the sendMessage() method to send email notifications using the Socketlabs API.
• Wrote documentation for configuring and using the Socketlabs adapter within the Utopia PHP messaging library.

Test Plan

To verify the functionality of this PR, follow these steps:

1. Configure the Socketlabs adapter with valid API credentials.
2. Create a message with the Socketlabs adapter.
3. Send the message using the sendMessage() method.
4. Verify that the message is successfully delivered via Socketlabs.
5. Run unit tests to ensure the adapter's correctness.

Related PRs and Issues

(If this PR is related to any other PR or resolves any issue or related to any issue link all related PR and issues here.)
This PR is not related to any other PRs or open issues in the Utopia PHP messaging library.

Have you read the Contributing Guidelines on issues?

(Write your answer here.)
Yes, I have read and followed the Contributing Guidelines for issues in the Utopia PHP messaging library.

[stnguyen90]

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