Allow Extensions (LSPs) to Work Across All Languages

[xhyrom]

Currently, to make extensions like zed-discord-presence work across all languages supported by Zed, I have to manually generate a large languages array.

For example, right now it looks like this:
https://github.com/xhyrom/zed-discord-presence/blob/main/extension.toml#L9-L269

It would be really helpful to have an option to allow an LSP to run globally (on all languages) without needing to specify every single one manually.
Maybe something like:
[language_servers.discord_presence]
name = "Discord Presence LSP"
languages = ["*"]

This would make extension development much easier, especially for extensions that are language-agnostic.