Display diagnostics from sfdx-hardis linters in code

[przemekrcloudity]

Using VS Code diagnostics API it is possible to display static analysis results in VS Code natively.
I think that it would be cool to use this API to display diagnostics directly in VS Code (for example from duplicate detector).
Of course, due to current "duplicate detector" implementation limitations, showing such diagnostics in exact line would be impossible as we don't know in which line the duplicate occurred, but it would still be useful to at least know that such duplicates exist in opened file.

[nvuillam]

I already played with Diagnostics API in VsCode Groovy Lint

This should not be too complicated, and indeed already having the file could be the first step to have the position in file (that we may find using some regexes from error msg )