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
db48c75231