feat: implement interactive API playground and comprehensive documentation

[menawar]

Resolves #710

What's Changed

• Interactive API Playground: Added ApiPlayground.tsx which allows users to test API endpoints with customizable inputs and API keys.
• Code Generation: Real-time generation of request snippets in multiple languages (cURL, JavaScript, Python, Go) based on user input.
• SDK Quickstart Guides: Added quickstart instructions for JavaScript, Python, and Go SDKs in their respective directories under sdks/.
• API Versioning & Changelog: Created api-versioning.md and changelog.md to document the API lifecycle and incorporated them into the DocumentationPage.
• Developer Portal UI: Upgraded the DocumentationPage to seamlessly embed the API Playground alongside the updated quickstart guides.

Testing Instructions

• Run the developer portal locally.
• Navigate to the Documentation section.
• Test out the new API Playground by configuring a request and checking the generated code snippets.
• Verify the mobile responsiveness of the updated layouts.

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