Docs update function develop

[choir241]

What does this PR do?

• Separate bodyText and bodyJson in codesnippets
• We should also remove mention of bodyRaw
• Add binary examples that return image from function
• Logging section
  • add how in most of the languages, we support spread operator
  • add relevant code samples ie log("Name", nickname, "Age", age)/error("error", error, "message", message )
• Add variables to accessing environment variables table
  • APPWRITE_FUNCTION_API_ENDPOINT
  • APPWRITE_VERSION APPWRITE_REGION
  • APPWRITE_FUNCTION_API_KEY
• Add Go under dependencies
• Fix [] wrapped placeholder variables
• Using with JWT
  • update copy for when there is no JWT token available
• Add Go to code structure
• Add Go code samples

Test Plan

Manually test code snippets and code structure

Related PRs and Issues

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Have you read the Contributing Guidelines on issues?

Yes