Toast

[ZZZank]

This PR added custom toast support.

• make a new notification builder via newly added binding Notification
• send the notification to player using notification.show() (Client script only) or player.notify(notification) (Client/Server)
• modify notification via notification.xxx(xxx), for example in client script:

Notification.ofText("wow")
    .backgroundColor(1234)
    .itemIcon("diamond")
    .duration("5s")
    .show();

[ZZZank]

Example usage, in client_script:

Notification.ofText(
    Text.of("some looooooooooooooooooooooooooooong line").append("\nwith a, not-long, line, yeah.")
)
    .itemIcon("minecraft:bedrock")
    .outlineColor(Color.BLUE)
    .show()

server_script example:

const notif = Notification.ofText(
    Text.of("some looooooooooooooooooooooooooooong line").append("\nwith a, not-long, line, yeah.")
)
    .itemIcon("minecraft:bedrock")
    .outlineColor(Color.BLUE)

Utils.getServer()
    .players
    .forEach((/** @type {Internal.PlayerJS<any>} */ player) => player.notify(notif))

They will produce the same result: