Add Ecovacs custom command event

[lnx85]

Breaking change

Proposed change

Add the ability to send custom commands that requires list as params (i.e. getPos that needs a list with two values, "deebotPos" and "chargePos"). Send custom commands' response with a new "ecovacs_custom_command" event.

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Hey there @overloadut, @mib1185, @edenhaus, @augar, mind taking a look at this pull request as it has been labeled with an integration (ecovacs) you are listed as a code owner for? Thanks!

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[lnx85]

HA supports service call responses and we should use it for this usecase.

Can you create a new service call in the ecovacs integration for it? I would call it send_custom_command or something similar

@edenhaus The original send_command service already allows to send custom commands but restricts params to dict instead of dict | list (requested in some custom commands). Do I really need to write a specific method instead of editing the original send_command?

[lnx85]

I tried implementing the Service Response but it is not working. The deebot_client library does not return a response after a service call but, instead, generates an asyncronous event with the response.

[lnx85]

The only command that requires list instead of dict is getPos. I'm working on a PR that implements the same feature by using deebot_client library.