Implement Home Assistant Context API to avoid EC blocking itself (replaces grace_period)

[danobot]

This PR replaces the implementation of grace_period introduced in # with the Context API. This allows EC to detect state changes that EC itself triggered by calling a services. These state changes are ignored by EC and therefore no longer interfere.

The configurable grace_period configuration will be deprecrated in this release.

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Description

Related Issues

Closes #192