Enable passing commands for batch mode as cli args

Currently commands for the `--commands` batch mode are read from a file. Some use cases may require only a single/few simple commands and creating a file for that can be overkill. In particular when sharing recipes with users:

- now: *first* create a file with `command1 command2 ...` and *then* execute
- `./miden-debug --commands cmds.txt ...`
- goal: pass commands directly as cli args
- `./miden-debug -ex command1 -ex command2 ...`

This corresponds to:

- `--one-line` in lldb [docs](https://lldb.llvm.org/man/lldb.html#cmdoption-lldb-one-line)
- `--eval-command` in gdb [docs](https://www.man7.org/linux/man-pages/man1/gdb.1.html)

Look at the existing batch mode implementation that reads commands from a file, likely in the CLI argument parsing logic (e.g., using clap). Add a new command-line argument (like `-ex`) that accepts multiple command strings. Integrate this with the command execution flow so that these arguments are processed similarly to file-based commands. Test by running the debugger with the new flag and verifying the commands execute.

Written by the indexing model from the issue text.