Function application signature help: consider adding parens to tupled arguments in tooltip

[cartermp]

When a function has tupled arguments, the tooltip is technically correct. However, it might be easy if you hit space after the function name to pass arguments not as a tuple since you need to look for the * separators instead of the -> separators:

[github-actions]

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This is a great follow-up to the closely-related #744. For context, PR #1469 was just created to address #744 — it ensures all curried parameters are returned in the Parameters array and that the active parameter index is always reported correctly.

This issue (#745) is a separate UX improvement: when a function has tupled arguments (e.g. let f (a: int, b: string) = …), the signature help tooltip should visually distinguish them from curried arguments by wrapping them in parentheses:

• Current display: a: int * b: string
• Proposed display: (a: int * b: string) — clearly a tuple, not curried

Where to implement this: the relevant code is in src/FsAutoComplete/LspServers/AdaptiveFSharpLspServer.fs in the getSignatureHelp function (or wherever the SignatureInformation.label is constructed from FCS data). The key insight is:

• FCS's FSharpMethodGroupItem.Parameters gives an array of FSharpMethodGroupItemParameter
• For a tupled function, all parameters belong to the same tuple group and there will be a *-separated type string
• You can detect a tupled group by checking parameter.CanonicalTypeTextForSuggestion or by looking at the method's HasParameters + parameter count vs. the original signature

A simple heuristic: if the method signature text contains * between parameters (and not -> between them), wrap the parameter group in (…).

This would be a modest, self-contained improvement worth adding — especially now that #744's curried-parameter fix is in place.

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