Implement definition provider, atm without range support for Scala 2 and Java symbols

[rochala]

This PR will use new method: symbolSource that is yet to be released and implemented by metals.

DefinitionProvider in SLS is kept simple with following heuristic:

1. Ask Presentation Compiler for SymbolSource,
2. • Scala 3 - You've successfully received path to tasty + range yay, we're good to go,
3. • Same source symbol - You've successfully received path to source + range, yay, we're done,
4. • Scala 2 / Java from external jar - We've received path to classjar, in classjar classfile. That's good enough to find source but sadly no range information
5. • Scala 2 / Java from our modules - ATM it is very similar to external jar, but we receive just classfile name. Then we can find source path by filtering workspace file for best match of the file (This can be improved by actually supporting Scala 2 targets with, e.g semanticdb, but this LSP is not about that)
6. If we have range, just return it, in other scenarios return 0, 0. In the future this will be replaced with actual parsers to find the definition. I think treesitter + JDT or scalameta dunno atm

video.mp4