Support setting breakpoints in get and set methods of classdef properties (bug #65610). * cdef-class.cc (cdef_class::cdef_class_rep::get_method): Also check for any `get` or `set` methods of `classdef` properties. * bp-table.cc (user_code_provider::operator ()): Support getting (closest) user code to `get` or `set` methods of `classdef` classes. (user_code_provider::populate_function_cache): Add `get` and `set` methods to function cache for `classdef` classes. * pt-eval.cc (tree_evaluator::get_user_code): Support getting user code for `get` or `set` methods of `classdef` properties. * test/classdef-debug/classdef_breakpoints2.m: Add handle class with get and set methods for new self tests. * test/classdef-debug/test-classdef-breakpoints.tst: Add new tests for adding and clearing breakpoints in `set` and `get` methods of `classdef` properties by line number or function name. Make sure breakpoints are deleted in existing tests also on test failures. Fix syntax error in 69eb4c27d8c8. * test/classdef-debug/module.mk: Add new file to build system. * etc/NEWS.10.md: Add note about new feature.

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