Add Duso language support

[davebalmer]

• LSP
• syntax highlighting

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[davebalmer]

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[davebalmer]

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[davebalmer]

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[MrSubidubi]

Please

• use the Worktree::which API to look for the Duso LSP binary and return an error if the binary cannot be found
• remove the grammars directory, as this should not be part of the extension here.

[davebalmer]

OK I will address these. Sorry I missed them. thank you!

BTW I saw the CLI fail, missing license. Weird my LICENSE file is Apache 2.0 what am I missing? https://github.com/duso-org/duso-zed/blob/main/LICENSE thanks again!

[davebalmer]

Hopefully the changes work. Please let me know. This is my first time making an extension for Zed 😁