feat: catch `CommandError` exceptions

[palazzem]

Related Issues

• Closes #112

Proposed Changes:

Catches all CommandError exceptions when the integration fails in changing the main unit state.

Testing:

n/a

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 7746212306

• -12 of 13 (7.69%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-1.5%) to 93.617%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
custom_components/econnect_metronet/devices.py	1	13	7.69%
<!--	Total:	1	13	7.69%	-->

Totals
Change from base Build 7746180095:	-1.5%
Covered Lines:	599
Relevant Lines:	643

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💛 - Coveralls