feat: Add active_theme_id function

[jk-gan]

Changes

• added active_theme_id method to the DotLottiePlayer, to return the loaded theme id
• updated multi animations integration tests to ensure the active_theme_id is updated correctly
• updated uniffi .udl to expose the active_theme_id function to CPP/Kotlin/Swift
• updated emscripten bindings for WASM

Close #119

I refer @theashraf implementation in #125.

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[theashraf]

Thanks, @jk-gan, overall, it looks great!

Just one comment I have:

Loading a new animation should clear the active theme ID, so we need to do that in the following methods:

load_animation_data
load_animation_path
load_dotlottie_data
Also, we can add another assertion to ensure the active_theme_id becomes empty after another load request for both dotLottie and Lottie animations.

[jk-gan]

I've updated the PR @theashraf

[theashraf]

LGTM 🚀

@jk-gan Thanks for your contribution!