Add support for using an entityfilter to subscribe_entities

[bdraco]

Proposed change

cc @bgoncal Please let me know if this will work for the iOS app

Same syntax as https://www.home-assistant.io/integrations/recorder/#configure-filter

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[bgoncal]

That's exactly what I was looking for, just one issue, the initial event returns all entities ignoring the filter.

[bdraco]

That's exactly what I was looking for, just one issue, the initial event returns all entities ignoring the filter.

I added the filter to the initial states as well as well as a test for both cases

[bgoncal]

Works like a charm for me 👍🏻