Rewrite or remove helper function formatCaptures

[phamkv]

The function formatCaptures() is marked as deprecated. The reason might be that we don't need the syntax tree to get the text for a certain syntax node anymore. Every tree-sitter syntax node has its containing text as property.

found in helper/helper.ts

[ChristianHuehn]

Please provide a small description on why we need this. I'm going through the stories and try to know what is needed and why 😀