Better build orchestration

The underlying build system of rbwasm build is quite messy.

1. Each build step has to have its ad-hoc up-to-date check like followings:
   https://github.com/ruby/ruby.wasm/blob/a5d06a01873130fda0f07f4401a3b018c6f1d753/lib/ruby_wasm/build/product/baseruby.rb#L26 https://github.com/ruby/ruby.wasm/blob/a5d06a01873130fda0f07f4401a3b018c6f1d753/lib/ruby_wasm/build/product/crossruby.rb#L171
2. Uses of build product and cache key computation are placed far, so we often forget to update the cache key and get a wrong cache restored.
   https://github.com/ruby/ruby.wasm/blob/a5d06a01873130fda0f07f4401a3b018c6f1d753/lib/ruby_wasm/build.rb#L78
3. The current cache mechanism cannot restore two or more artifacts produced within a single rake task job. This usually happens for PIC & non-PIC builds invoked by rake npm:ruby-head-wasm-wasi:build
4. Our cache mechanism does not allow partial cache-hit, so even if we change only crossruby source revision, we have to rebuild openssl from scratch.
5. Our cache mechanism is not sensitive to recipe changes. For instance, even if we change CFLAGS value, crossruby product will not be rebuilt.

Bắt đầu bằng cách đọc lib/ruby_wasm/build.rb và các phần triển khai product trong lib/ruby_wasm/build/product/baseruby.rb và crossruby.rb. Theo dõi entry point rake npm:ruby-head-wasm-wasi:build cùng các artifact PIC và non-PIC của nó. Hoàn thành khi build cache xử lý được nhiều artifact, các lần hit một phần và các thay đổi đối với source revision và recipe mà không khôi phục các kết quả không chính xác.