chore: 🤖 add benchmarks

[theashraf]

Changes:

• Added few benchmarks for the performance critical pieces of dotlottie_player_core:
  • animation loop
  • load dotLottie file
  • load Lottie animation by data
  • load Lottie animation by path
  • load a dotLottie theme

Usage:

• run make bench or cargo bench inside dotlottie-rs crate
• An HTML report displaying the results of the benchmark under dotlottie-rs/target/criterion/report/index.html. By default, the plots are generated using gnuplot if it is available, or the plotters crate if it is not.

Catching performance regression:

• For future PRs
• Check out the main branch of your code
• Ensure dotlottie-rs/target/criterion/ is empty, maybe run cargo clean
• Build it and run the benchmarks once, to establish a baseline
• Then switch to the pull request branch
• Built it again and run the benchmarks a second time to compare against the baseline.

Fix #124

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