Raise error when fundamental callback is not implemented

[Joao-Dionisio]

Same as was done in other plugins (eg, pricer).

[Copilot]

Pull request overview

This PR improves error handling for fundamental callbacks in plugin base classes by raising NotImplementedError instead of printing error messages. This change enforces proper implementation of required methods in derived classes and aligns with the pattern already established in other plugins like pricer and branchrule.

• Replaces print statements with NotImplementedError exceptions for fundamental callbacks
• Updates error messages to follow a consistent pattern across all plugin types
• Affects 7 plugin files: propagator, presol, heuristic, event, conshdlr, benderscut, and benders

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/pyscipopt/propagator.pxi	Raises NotImplementedError for propexec() and propresprop() fundamental callbacks
src/pyscipopt/presol.pxi	Raises NotImplementedError for presolexec() fundamental callback
src/pyscipopt/heuristic.pxi	Raises NotImplementedError for heurexec() fundamental callback
src/pyscipopt/event.pxi	Raises NotImplementedError for eventexec() fundamental callback
src/pyscipopt/conshdlr.pxi	Raises NotImplementedError for consenfolp(), consenforelax(), consenfops(), conscheck(), and conslock() fundamental callbacks
src/pyscipopt/benderscut.pxi	Raises NotImplementedError for benderscutexec() fundamental callback
src/pyscipopt/benders.pxi	Raises NotImplementedError for benderscreatesub() and bendersgetvar() fundamental callbacks

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