Use either `binaryen-rs` dep or `wasm-opt` binary (#168)

* Fix `#[warn(clippy::ptr_arg)]`

* Use either `binaryen-rs` dep or `wasm-opt` binary

* Implement reviewers suggestions

* Rename `optimization_level` to `optimization_passes`

* Revert "Rename `optimization_level` to `optimization_passes`"

This reverts commit 1fd35bcd.

* Update installation instructions

* Update readme

* Add package manager links