feat: add openai text to speech api

[mazyaryousefinia]

What
This PR adds an example implementation of OpenAI's Text-to-Speech (TTS) API using Go. It includes setting up the API client, converting text to speech, saving the output, and playing the generated audio.

Why
This feature provides a simple and practical way to integrate OpenAI's TTS capabilities into Go applications, enabling AI-driven voice synthesis.

How

Establishes a connection to OpenAI's TTS API.
Sends text input for speech synthesis.
Saves the generated speech as an audio file.
Includes optional playback functionality.
Let me know if any changes are needed! 🚀

PR Checklist

• Read the Contributing documentation.
• Read the Code of conduct documentation.
• Name your Pull Request title clearly, concisely, and prefixed with the name of the primarily affected package you changed according to Good commit messages (such as memory: add interfaces for X, Y or util: add whizzbang helpers).
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. Fixes #123).
• Describes the source of new concepts.
• References existing implementations as appropriate.
• Contains test coverage for new functions.
• Passes all golangci-lint checks.