Add -m, -e and -d filters to %logstart 🤖🤖 - #15401

Closes #15344

%logstart gets three flags for keeping a session log that replays cleanly:

• -m leaves out cells containing IPython special commands (magics, shell escapes, help lookups), i.e. input that IPython rewrites into get_ipython() calls.
• -e leaves out input that raised. The entry, and its -o output, is held until post_run_cell reports the result. Pending entries are a stack, so cells run from inside a cell (%%capture, %rerun, %paste) are kept; an inner cell is written when it finishes, so it precedes the outer one.
• -d leaves out input that was already logged in the session. An errored entry dropped by -e does not count as logged.

They combine, for example %logstart -med session.py. %logstate reports them.

Two limits, both stated in the docstring: the filters apply to input entered after %logstart (the history written when the log starts is not filtered), and -m works per cell rather than per line, since raw-mode lines do not map one-to-one onto the transformed cell.

Docs: the magic docstring, docs/source/interactive/reference.rst, and a whatsnew/pr file.

Tests in tests/test_logger.py: each flag on its own, -rm, -oe output ordering, a nested %%capture cell under -e, -ed together, -d resetting between logs, a check that magics are still logged without -m, and %logstate output.

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