DI token resolving the factory used to instantiate a
CngxChipStripRovingController. Defaults to
createChipStripRoving; override via
providers: [{ provide: CNGX_CHIP_STRIP_ROVING_FACTORY, useValue: customFactory }]
or per-component via viewProviders to install telemetry wrappers,
a controlled-from-outside focus mode, or a custom keyboard policy
without forking the reorderable component.