fix: 🐛 on_loop/on_complete events are not triggered when in Reverse/Forward modes

[theashraf]

Issue 1:

• The on_loop / on_complete event isn't consistently triggered in Reverse/Forward modes because it doesn't reach the last frame properly.

Fix 1:

• Modify the handle_reverse_mode and handle_forward_mode functions to always return the last frame number once a loop is completed. This adjustment ensures that the animation progresses smoothly, allowing the request_frame function to tick to the next frame based on the current animation state, and ensures the loop/complete events are triggered.

• Address the issue with the set_frame function, which updates the start_time while the animation is playing. This behavior can cause problems, particularly with accuracy differences across platforms, leading to the animation loop constantly updating the start_time as the animation progresses. To resolve this, provide an independent seek method to handle seeking behavior, ensuring that the set_frame function remains pure and is only used in the animation loop.

Issue 2:

• The "play" method doesn't reset the direction and the current_frame if the animation is playing from the stopped playback_state.

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Latest commit: 98b6ac3

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