Extend `parser` Service to Support Parsing of C# and Java Source Code

[nuthanmunaiah]

Description

The scope of the parser service, by virtue of it using clang, was restricted to support parsing of source code written in C or C++. However, with the refactoring of the service to use srcml instead of clang (Issue #18) to parse source code, the parser service is now capable of parsing source code written in C# and Java. The service must therefore be updated to add C# and Java as supported languages.