Show file path for workspace symbols

[tgodzik]

Previously, we would not show the path to file containing the symbol, which would be problematic if we had the same name for different symbols. Now, we additionally show the path.

[kpodsiad]

I took the liberty of pushing suggestions directly.
When you're dealing with possible undefined properties you could use optional chaining syntax ?. - const workspaceUri = workspace.workspaceFolders?.[0]?.uri;

[tgodzik]

Perfect! Thanks!