Add support for more symbols on CodeParser

Based on #185 (comment 1482411462)

Language	Classes	Comments	Functions	Imports
LanguageId.C	N/A	✅	✅	✅
LanguageId.CPP	N/A	✅	✅	✅
LanguageId.CSHARP	✅	✅	see follow-up	✅
LanguageId.GO	N/A	✅	✅	✅
LanguageId.JAVA	✅	✅	see follow-up	✅
LanguageId.JS	✅	✅	✅	✅
LanguageId.PHP	✅	✅	✅	✅
LanguageId.PYTHON	✅	✅	✅	✅
LanguageId.RUBY
LanguageId.RUST	N/A	✅	✅	✅
LanguageId.SCALA	✅	✅	✅	✅
LanguageId.TS	✅	✅	✅	✅
LanguageId.KOTLIN

Follow-up:

1. Traverse the tree up to a depth level instead of only checking one level deep. Functions in Java/CSHARP can only be defined inside a class, so they are not reachable with a traversal depth of one.