feat(cli): add --stdio argument to lsp-proxy command

[nhedger]

Summary

This PR introduces a bogus --stdio argument for the lsp-proxy command.

According to the Implementation Considerations section of the LSP specification, it is recommended that language servers support the --stdio argument if the server communicates over stdio.

The absence of this argument actually makes it harder to spawn Biome's LSP when using vscode-languageclient, because it appends an --stdio argument to the command, and since the lsp-proxy command does not support it, the binary exits with an error.

By introducing this bogus (and hidden) argument, we make it easier to interface with Biome's LSP.

Test Plan

Try spawning Biome's LSP using vscode-languageclient:

new LanguageClient(
	"biome",
	{
		command: bin.fsPath,
		transport: TransportKind.stdio,
		args: ["lsp-proxy"],
	},
	{
		outputChannel: logger,
		traceOutputChannel: window.createOutputChannel(`Biome LSP`, {
			log: true,
		}),
		documentSelector: this.generateDocumentSelector(),
	},
);

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[ematipico]

Nice!