[doc] How to debug a charm, the jhack way

Currently, we only have:

https://juju.is/docs/sdk/debug-a-charm

There should probably be dedicated tutorials/howtos for:
- jhack sync + juju resolve
- jhack eval

This issue is part of a cross-team effort ([juju](https://bugs.launchpad.net/juju/+bug/2093113), [jhack](https://github.com/canonical/jhack/issues/204), [ops](https://github.com/canonical/operator/issues/1520), [o11y](https://github.com/canonical/tempo-operators/issues/28)) for improving debugging docs.