Add an option to show the entire command an LLM wants to execute

[mbmjertan]

Currently, Zed trims the commands a LLM wants to execute in Write mode if they are multiline without an option to expand it.

This is dangerous! I need to approve or disapprove a command that a LLM wants to run without seeing it.

For example, Zed simply displays this:

php artisan tinker --execute=' -- 9 more lines

[Always allow] [Allow] [Deny]

I have no way to actually verify, it's a roll of the dice whether the execute contains a rm -rf /.