feat(service): add `update_state` service to force alarm updates

[palazzem]

Related Issues

• Closes #160

Proposed Changes:

Add update_state service so that users can trigger a full update manually (through lovelace dashboard) or programmatically (through automations).

Add the Update Button

Add a button in the Lovelace dashboard as follows:

1. Add a card of type "button".
2. In "Entity", select your Alarm Panel.
3. In "Tap Action", select "Call Service".
4. In "Service", select "e-Connect/Metronet Alarm: Update Alarm State".
5. Click "Save".

The screenshot below is a configuration example; update it based on your needs:

Testing:

Trigger update_state service.

Extra Notes (optional):

n/a

Checklist

• [x] Related issues and proposed changes are filled
• [x] Tests are defining the correct and expected behavior
• [x] Code is well-documented via docstrings

[coveralls]

Pull Request Test Coverage Report for Build 9319499272

Details

• 7 of 8 (87.5%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.04%) to 91.785%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
custom_components/econnect_metronet/init.py	0	1	0.0%
<!--	Total:	7	8	87.5%	-->

Totals
Change from base Build 9158476390:	-0.04%
Covered Lines:	707
Relevant Lines:	776

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💛 - Coveralls