Signature help

This feature enables the [Signature Help request](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.18/specification/#textDocument_signatureHelp).


- [Implementation](https://github.com/wkillerud/some-sass/blob/main/packages/language-services/src/features/do-signature-help.ts)
- [Tests](https://github.com/wkillerud/some-sass/blob/main/packages/language-services/src/features/__tests__/do-signature-help.test.ts)

![Demo showing how the signature help feature looks in VS Code. A popup is live updated showing the current function argument, and the documentation for the function.](https://github.com/user-attachments/assets/a60e9e9f-e2f1-472a-8aa6-e6d6996ace06)


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Signature help #16

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