Customizable console

[tokuhirom]

Current implementation of the console is not customizable. i mean, it's hard-coded to print/eprint.
I want to forward the console's output to the logger. could you support it?

https://github.com/boa-dev/boa/blob/main/core/runtime/src/console/mod.rs

If i can use the console class like this, it's very nice to me(I can save the boa's output to file or something).

Console::init_with_callback(&context, |msg| {
  log::Info!("[boa] {}", msg)
})