🐞 Deprecated dependencies

### Description

Hello! This repo relies on two libraries that are both officially unsupported.

(ConcurrencyPlus)[https://github.com/chimeHQ/ConcurrencyPlus] is functional, but all the major components have been replaced by much better implementations. I'll help you migrate if you need to.

(ProcessService)[https://github.com/ChimeHQ/ProcessService] relies on a mechanism that Apple no longer accepts for App Store review. It's a dead-end. I think the most-promising alternative for language servers specifically is to use User Scripts, which supported by (LanguageClient)[https://github.com/ChimeHQ/LanguageClient] today:

https://github.com/ChimeHQ/LanguageClient/blob/main/Sources/LanguageClient/DataChannel%2BUserScript.swift

### To Reproduce

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### Expected Behavior

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### Version Information

CodeEditKit: [e.g. 0.0.x-alpha.y]
macOS: [e.g. 13.2.1]
Xcode: [e.g. 14.2]

### Additional Context

_No response_

### Screenshots

_No response_