fix clippy issues

[bird-dancer]

Due to an ABI mismatch between clang and rust, wasm-bindgen older then 2.88 will become incompatible with the rust compiler at some point. See https://github.com/rust-lang/rust/pull/63649 and https://github.com/rust-lang/rust/issues/71871 . In later versions of wasm-bindgen JsValue::from_serde and JsValue::into_serde are deprecated and using serde-wasm-bindgen is suggested instead. See https://github.com/rustwasm/wasm-bindgen/pull/3031 .

This pr also fixes the following clippy issues:

• use contains_key instead of get().is_some()
• implement Display instead of ToString for G2AFFINE
• don't use enumerate when index is dropped
• replace legacy function isize::max_value with isize::Max