extend support for tree sitter to more languages

[pombredanne]

Some candidates:

• https://github.com/jiyee/tree-sitter-objc Add objective c parser for symbols #30
• https://github.com/alex-pinkus/tree-sitter-swift Add swift parser for source symbols #31
• https://github.com/tree-sitter/tree-sitter-c-sharp Add C# source symbol parsers #32
• https://github.com/fwcd/tree-sitter-kotlin
• https://github.com/ganezdragon/tree-sitter-perl
• https://github.com/r-lib/tree-sitter-r
• https://github.com/tree-sitter/tree-sitter-css
• https://github.com/tree-sitter/tree-sitter-haskell
• https://github.com/tree-sitter/tree-sitter-php
• https://github.com/tree-sitter/tree-sitter-ruby
• https://github.com/tree-sitter/tree-sitter-typescript
• https://github.com/tree-sitter/tree-sitter-go