PR: improve ipykernel debugging

[impact27]

set_debug_state is a call that doesn't really add value as the debugging information is contained in the debugging prompts. In addition, this improves non spyder-kernels debugging by adding syntax highlighting, command history, and numbered prompts.

Goes with https://github.com/spyder-ide/spyder-kernels/pull/411

Description of Changes

• [ ] Wrote at least one-line docstrings (for any new functions)
• [ ] Added unit test(s) covering the changes (if testable)

• [ ] Included a screenshot or animation (if affecting the UI, see Licecap)

Issue(s) Resolved

Fixes #

Affirmation

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