refactor: use multi select in setup options

[xtimmy86x]

Related Issues

Closes #60

Proposed Changes:

Transform the configuration of sectors in the options flow from textual input to a multi-select interface for a better and more user-friendly experience

Testing:

Extra Notes (optional):

Old method:

New method:

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 6720371468

• 61 of 66 (92.42%) changed or added relevant lines in 5 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.3%) to 88.031%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
custom_components/econnect_metronet/helpers.py	9	10	90.0%
custom_components/econnect_metronet/config_flow.py	2	6	33.33%
<!--	Total:	61	66	92.42%	-->

Files with Coverage Reduction	New Missed Lines	%
custom_components/econnect_metronet/config_flow.py	1	62.82%
<!--	Total:	1		-->

Totals
Change from base Build 6677072536:	-0.3%
Covered Lines:	480
Relevant Lines:	548

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💛 - Coveralls