feat: 🎸 theming

[theashraf]

Changes:

dotlottie_core:

• load_theme: Added to accept a theme_id, enabling it to load and apply a theme from a .lottie file based on its applicability to the currently active animation.
• load_theme_data: Added to take a JSON string representing the slots object, facilitating the direct application of theme data to the rendering engine.

dotlottie_fms:

• get_theme: Added to fetch a theme by its id from the .lottie file.

dotlottie_ffi:

• FFI and WASM Bindings Update: updated the .udl and WASM bindings to include the new load_theme and load_theme_data functions.

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[afsalz]

Awesome 🚀

[afsalz]

Just wondering why we're not utilising setConfig for setting themes as well.

[theashraf]

@afsalz for consistency with other methods (load_animation & load_animation_data) we use to load internal or external animation assets, a theme is just another asset in the .lottie file. Also, set_config doesn't provide feedback for the success or failure of the operation.