feat: add tvg-partial feature flag for ThorVG partial rendering

[theashraf]

Integrates ThorVG's partial rendering optimization via a dedicated
feature flag. Partial rendering tracks dirty regions and only redraws
changed portions of the scene

Changes:

• Add tvg-partial feature to dotlottie-rs (included in dev bundle)
• Add tvg-partial to dotlottie-ffi defaults (matches ThorVG upstream)
• Configure THORVG_PARTIAL_RENDER_SUPPORT in build.rs
• Add feature_partial_rendering input to build.yml workflow
• Support tvg-partial in all platform builds (Apple, Android, WASM, Linux)

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Latest commit: c42d96f

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[github-actions]

📊 Benchmark Results

dotlottie-rs

Benchmark	Change	Confidence Interval	Status
load_animation_data	+2.80%	[+2.23%, +3.38%]	⚡ Slight change
state_machine_load	+1.74%	[+1.40%, +1.99%]	✅ No change
load_dotlottie_data	+0.04%	[-0.27%, +0.32%]	✅ No change
set_theme	+0.01%	[-0.32%, +0.28%]	✅ No change
animation_loop_frame_interpolation	-1.20%	[-4.31%, +1.88%]	✅ No change
state_machine_load_data	-1.47%	[-1.77%, -1.05%]	✅ No change
animation_loop_no_frame_interpolation	-2.73%	[-5.54%, +0.13%]	⚡ Slight change
load_animation_path	-3.55%	[-3.98%, -3.15%]	⚡ Slight change

How to interpret these results

• Change: Estimated performance difference (negative = faster, positive = slower)
• Confidence Interval: 95% confidence bounds for the change
• Regression: Lower bound > +5% (confidently slower)
• Improvement: Upper bound < -5% (confidently faster)

Criterion uses statistical analysis to account for noise and provide reliable comparisons.

[hermet]

@theashraf Hello, Please note that the partial rendering is not practically beneficial for dotlottie runtime at this time. Rather it may have downsides, such as increasing the binary size. You can add the support with an option but not recommend in enabling for production.

[theashraf]

@theashraf Hello, Please note that the partial rendering is not practically beneficial for dotlottie runtime at this time. Rather it may have downsides, such as increasing the binary size. You can add the support with an option but not recommend in enabling for production.

Thanks @hermet! we'll introduce it as an optional feature for experimental builds, and it won’t be enabled in production