Plugin API: terminal_command strips away quotes

[msirringhaus]

Issue description

The PaneInfo that a plugin receives on PaneUpdate-events contains the terminal_command as a string. This string is however missing the quotes that the command was launched with, e.g.:
bash -ic ssh server instead of the expected bash -ic "ssh server".

Thus, splitting the command into it's bash-components doesn't work (["bash", "-ic", "ssh", "server"] vs. expected: ["bash", "-ic", "ssh server"]).

Minimal reproduction

use zellij_tile::prelude::*;

use std::collections::BTreeMap;

#[derive(Default)]
struct State {
    manifest: PaneManifest,
}

register_plugin!(State);

impl ZellijPlugin for State {
    fn load(&mut self, _configuration: BTreeMap<String, String>) {
        request_permission(&[PermissionType::ReadApplicationState]);
        subscribe(&[EventType::PaneUpdate]);
    }
    fn update(&mut self, event: Event) -> bool {
        match event {
            Event::PaneUpdate(manifest) => {
                self.manifest = manifest;
                true
            }
            _ => false,
        }
    }
    fn render(&mut self, _rows: usize, _cols: usize) {
        println!("The command panes:");
        for panes in self.manifest.panes.values() {
            for pane in panes {
                if !pane.is_plugin {
                    println!("{:?}", &pane.terminal_command);
                }
            }
        }
    }
}

Open this plugin with zellij plugin --skip-plugin-cache -- file:/path/to/rust-plugin-example/target/wasm32-wasi/debug/rust-plugin-example.wasm , then open a command pane with zr ssh server or zellij run -- bash -ic "ssh server" and look at the output.

The output should contain Some("bash -ic \"ssh server\""), but has Some("bash -ic ssh server").