Add paste selection hot-key

[cirego]

iTerm has a special paste feature called paste-selection that copies highlighted text. This is really useful when copying commands into the terminal.

For example, I often create new branches in git and then attempt to push them without creating an upstream tracking branch. When this happens, git outputs a message like the following:

fatal: The current branch cirego/branch has no upstream branch.
To push the current branch and set the remote as upstream, use

    git push --set-upstream origin cirego/branch

To have this happen automatically for branches without a tracking
upstream, see 'push.autoSetupRemote' in 'git help config'.

Using iTerm, I can highlight the git push ... command, hit cmd-shift-v and it will paste the command for me (without having to do cmd-c, cmd-v). It's a small time saver that would be lovely to include in Zed.

[bbb651]

There's a very similar feature on linux called primary selection that has been implemented in zed for a while #10534.
Conceptually it's the same feature but the implementation would be quite different because on linux it's system-wide and handled through the windowing system (wayland or x11), this would have to be entirely inside zed and should probably only apply to the terminal.

I thought about it recently and it would be really nice if terminals had a protocol similar to OSC 8 hyperlinks that instead of opening a uri would replace the current commandline, then git would link the command in this case and you could just Ctrl+Click+Enter it, and with git everywhere a commit hash or branch appears it could be linked to git checkout ..., etc. (this has some security implication, but the same mitigations used for clipboard pasting can be used, in terms of implementation it sounds quite hard because it requires deep shell integration). Very off-topic though