Allow more fine-grained configuration of tagged hints

I am using pyright through the LSP with NeoVim. Pyright currently displays a hint when I define a function where an argument isn't used, e.g.:

I would like to disable this specific hint *without* disabling all Pyright hints. I like the reachability analysis, but I have a separate linter that handles things like unused arguments and I find that specific hint noisy. The only relevant setting I've seen is `pyright.disableTaggedHints` which isn't precise enough. I do not want to rename all my unused variables to `_` or refactor my code in any way to workaround a purely visual issue in my editor.

Thank you for your consideration on this

Start by tracing how pyright.disableTaggedHints is exposed and how the unused-argument hint is identified in the language-server path. Define the configuration boundary needed to suppress that hint while retaining reachability hints, then add coverage for the separate behaviors; the issue does not name specific files or tests.

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