Add go to symbol plugin

This is my first plugin for Kate. With this plugin you can quickly navigate to a symbol (method, class) in the current file using the shortcut "Ctrl+Alt+P". It uses ctags(universal) internally to get the symbol information. I haven't tested it extensively with every language. Languages that I have tested it with:

• C / C++
• Javascript
• Rust
• OCaml (works, not sure how good it is with this)
• Go lang
• Markdown

Inspired by: Vim fzf (:BTags), VS Code Go to symbol
Icons are from KDevelop

Indirectly related
BUG: 376480

Screenshot: