Add cpp support

Zsolt Simonrequested to merge
szsolt7/sonarlint.nvim:main into main

Adding cpp support to sonarlint.nvim.

In order to work, compile_commands.json needs to exists in the root folder of the project.

More information about how to generate a compilation database can be found here: https://github.com/SonarSource/sonarlint-vscode/wiki/C-and-CPP-Analysis#generate-a-compilation-database

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