`jj bisect run --command` splits the argument on spaces, so
e.g. `--command 'cargo test'` will run `cargo` with `test` as
argument. It is hard to pass more complex commands to because we don't
parse e.g. quotes as the shell would (and we wouldn't match the user's
preferred shell even if we did).
This patch deprecates the `--command` argument in favor of positional
arguments, so the user can do things like this:
```
jj bisect run --range ..main -- bash -c 'jj duplicate -r xyz -B @ && cargo test'
```
That will run the tests with the `xyz` change applied.
This adds a command that automatically bisects a range of commits
using a specified command. By not having the interactive kind
(e.g. `jj bisect good/bad/skip/reset`), we avoid - for now at least -
having to decide where to store the state. The user can still achieve
interactive bisection by passing their shell as the bisection command.
Closes#2987.
