Move binary scripts to build.rs

[vivianjeng]

Problem

Now we use CLI to generate bindings for iOS and Android

• https://github.com/zkmopro/mopro/blob/main/mopro-ffi/src/app_config/ios.rs
• https://github.com/zkmopro/mopro/blob/main/mopro-ffi/src/app_config/android.rs

but if it could be moved to build.rs instead of running cargo run --bin ios
It would make the building easier

Details

Ideally we just move the script to mopro-ffi/build.rs
and when users activate

[build-dependencies]
mopro-ffi = {version = "0.1", features = ["ios"]}

the current app_config/ios.rs scripts executed and the bindings are generated

Question
The current uniffi needs to build first and execute binary after building
e.g.

cargo build --release
cargo run --bin uniffi-bindgen generate --library target/release/libmath.so --language kotlin --out-dir out

not sure if it can be executed in the same build script

Acceptance criteria

Run the scripts

• https://github.com/zkmopro/mopro/blob/main/mopro-ffi/src/app_config/ios.rs
• https://github.com/zkmopro/mopro/blob/main/mopro-ffi/src/app_config/android.rs
  in test-e2e/build.rs