Significantly reduce overhead to filter event triggers

[bdraco]

Proposed change

The large number of vol.Schema validate_mapping calls was contributing to sluggish performance and poor response times. In most cases we can avoid it and do a simple dict .items() compare. For complex nested cases, continue to fallback to the expensive vol.Schema validate_mapping path (these should be rare and there are much better ways to write the automations already available).

profile courtesy of @Madelena

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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (homeassistant) you are listed as a code owner for? Thanks!

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[bdraco]

This one is slow enough to impact the UI and be a major contributing factor to integrations triggering the slow update warning.

Will tag for beta and undraft after running it on production for a bit.