Add a state filter to logbook card

[karwosts]

Proposed change

Add an optional state filter to logbook/activity card. Sometimes you want to have a log of some rare events, like maybe a leak sensor turning on, and the fact that a target entity transfers from off -> unknown -> off 100+ times is both uninteresting and clutters the display uselessly.

Fairly highly voted feature request.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion: https://community.home-assistant.io/t/logbook-card-filter-states/336632
• Link to documentation pull request: Logbook state_filter option home-assistant.io#41515

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[MindFreeze]

Please add to state_filter to LogbookCardConfig. Docs have to be updated too https://www.home-assistant.io/dashboards/logbook/

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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