Add basic bash and Python tasks (#10548)

Part of https://github.com/zed-industries/zed/issues/5141

* adds "run selection" and "run file" tasks for bash and Python.
* replaces newlines with `\n` symbols in the human-readable task labels
* properly escapes task command arguments when spawning the task in
terminal

Caveats:

* bash tasks will always use user's default shell to spawn the
selections, but they should rather respect the shebang line even if it's
not selected
* Python tasks will always use `python3` to spawn its tasks now, as
there's no proper mechanism in Zed to deal with different Python
executables

Release Notes:

- Added tasks for bash and Python to execute selections and open files
in terminal

crates/terminal_view/Cargo.toml

@@ -28,6 +28,7 @@ search.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 settings.workspace = true
+shlex.workspace = true
 shellexpand.workspace = true
 smol.workspace = true
 terminal.workspace = true

crates/terminal_view/src/terminal_panel.rs

@@ -1,4 +1,4 @@
-use std::{ops::ControlFlow, path::PathBuf, sync::Arc};
+use std::{borrow::Cow, ops::ControlFlow, path::PathBuf, sync::Arc};
 
 use crate::TerminalView;
 use collections::{HashMap, HashSet};
@@ -319,6 +319,7 @@ impl TerminalPanel {
         let args = std::mem::take(&mut spawn_task.args);
         for arg in args {
             command.push(' ');
+            let arg = shlex::try_quote(&arg).unwrap_or(Cow::Borrowed(&arg));
             command.push_str(&arg);
         }
         spawn_task.command = shell;