Add key_code value as part of dom_sender map about drab HOT 3 CLOSED

By default, events send some information back to the server, as described in docs here - https://hexdocs.pm/drab/Drab.Commander.html#content - so you can have the value, text, html etc of the sender DOM object. Maybe it is a good idea to add the event object here, so you could read its properties. I'll think about it.

The simple example is here https://tg.pl/drab#broadcast - but it launch the event on every key press. From the performance perspective, it would be nice to have some kind of "throttle" event, which is launched on the JS side when user stop pressing the keys with some delay, like 0.5 second. I will add it to the TODO

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Thank you @grych

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Added in v0.2.6

• added event object with specified properties to the dom_sender
• added debounce function as an option to the event handler

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