feat: 🎸 expose lottie animation original size

[theashraf]

This pull request introduces a new feature to expose the original size of an animation using the tvg_picture_get_size function from the ThorVG C API. The retrieved animation size information is then stored in the LottieRenderer for future queries.

Changes

• dotlottie-ffi/Cargo.wasm.toml: Updated package version to 0.1.22.
• dotlottie-ffi/emscripten_bindings.cpp: Added animationSize function binding to DotLottiePlayer.
• dotlottie-ffi/src/dotlottie_player.udl: Added animation_size function to the DotLottiePlayer interface.
• dotlottie-ffi/src/dotlottie_player_cpp.udl: Added animation_size function to the DotLottiePlayer interface.
• dotlottie-rs/src/dotlottie_player.rs: Implemented animation_size method to return the width and height of the loaded animation.
• dotlottie-rs/src/lottie_renderer/mod.rs: Added picture_width and picture_height fields to LottieRenderer and initialized them in the load method.
• web-example.html: Updated example to log the animation size using the new animationSize method.

Usage

let dotlottie_player = DotLottiePlayer::new(Config::default());

// Method to return a vec [width, height] as retrieved from `tvg_picture_get_size`
dotlottie_player.animation_size();

fix #175

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