add support for updating passwords via options flow

[dalinicus]

• Adds Update Password field to options flow dialog
• Add dialog to prompt restarting Home Assistance when password is updated.

resolves #43

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (34df9d3) 100.00% compared to head (526236c) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #44 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 11 11 Lines 634 660 +26 ========================================= + Hits 634 660 +26 ```

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