CLI bundle: add debug and kernel options. fixes #1447

[paracetamolo]

Closes #1447

Improve the bundle command:

• add an explicit --debug option, which is otherwise false by default
• add a --kernel option to pass the main kernel file and treat the directory as the kernel namespace library.

Also enforces that any library, kernel or not, has at least one export.

Note: we can still build a library w/o exports using from_dir which does not use Library::new.

[plafer]

Thank you for taking this one on! Left a few suggestions

[plafer]

Also, to get the changelog CI to pass, you need to add an entry to CHANGELOG.md

[paracetamolo]

The command also includes the stdlib now (for both kernel and normal libraries). This was necessary to bundle api.masm. Tested with:

cargo run --features executable -- bundle ~/miden/miden-base/miden-lib/asm/kernels/transaction/lib --kernel ~/miden/miden-base/miden-lib/asm/kernels/transaction/api.masm

Not sure if the test could be added to miden-base.

[plafer]

Just a quick pass

[plafer]

LGTM!