Zhiming Ma

Changes: - Add support for http proxy. The proxy can be configured using: - environment variables ( http_proxy, https_proxy, no_proxy ) [more detail](https://github.com/nodejs/undici/blob/main/docs/docs/api/EnvHttpProxyAgent.md) - in `~/.tabby-client/agent/config.toml`, override environment variables ```yaml...

WIP Completed: - Connected the plugin to tabby-agent via LSP using lsp4e. - Implemented a ContentAssistProcessor to provide code completion for generic editors. This implementation is modified from [LSContentAssistProcessor.java](https://github.com/eclipse/lsp4e/blob/main/org.eclipse.lsp4e/src/org/eclipse/lsp4e/operations/completion/LSContentAssistProcessor.java). It...

@liangfung related #2800