feat(cli): Creating function from all available templates

[byawitz]

What does this PR do?

• Refactor the function starter template from function-starter to templates.
• Adds the option to choose from many available templates.

Test Plan

Java doesn't have any templates other than the starter one, so it will be chosen by default

https://github.com/appwrite/sdk-generator/assets/316103/9133b0ee-509c-4296-959b-2ac2cc9f3594