Refactor EditorUIService to use LSP showMessage and showMessageRequest

Prerequisites

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Summary

EditorUIService currently uses custom messages to handle prompts. They should use the LSP spec for this instead so it doesn't have to be handled special in the client.

https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#window_showMessageRequest

Proposed Design

Replace existing messaging with LSP but keep methods the same if possible to avoid breaking.

首先定位 EditorUIService，并查看其当前如何处理自定义提示消息。阅读链接的 LSP 3.17 window/showMessageRequest 规范，然后识别现有的消息方法，并确定它们是否可以在使用 LSP 消息传递的同时保留其签名；当提示使用标准 LSP 消息且无需客户端进行特殊处理时，即表示完成。