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feat: add disable_corefiles context option (#2638)

* feat: add disable_corefiles context option

Add new context option that automatically disables core file generation
when enabled. This sets RLIMIT_CORE to (0, -1) to prevent core dump creation,
which is particularly useful for brute-force scenarios and repeated segfault
crashes where core files consume excessive disk space.

- Add disable_corefiles context variable with boolean type.
- Add @_validator decorator for disable_corefiles context variable
- Default value is False to maintain existing behavior.

Fixes #2566

* Update CHANGELOG

* Add doctest for `context.disable_corefiles`

Added doctest for `disable_corefiles` in corefile.py
Added doc for `disable_corefiles` in process.py
When `context.corefiles` is enabled:
For crashed process, `io.corefile` will return None.
For running process, gdb still dumps the corefile.

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