Make FPS updates activatable at runtime

[pecoram]

Currently, renderOptions.fpsUpdateInterval enables FPS updates when set to a value different from 0, but it can only be defined at creation time and cannot be modified dynamically.

It would be beneficial to allow changing this value at runtime, enabling or disabling performance monitoring without requiring a complete reinitialization.

Use Case:
In some scenarios, developers may want to enable FPS monitoring only under specific conditions (e.g., debugging or performance profiling) and disable it dynamically when not needed at runtime.