Feature/dpg fixes and improvements

[eniosultan]

• Fixed issue with alarm and event icons not in real-time
• Added new option which adds legend for units -> Issue Option to show legend – especially unit – on the axes (similar as before) #40
• Increased default widget width -> Issue Default widget width not defined/looks broken #39
• Simplified display options for aggregation -> Issue Display options for aggregations can be simplified #33
• Date time selector is greyed out when realtime is selected -> Issue When real-time time is selected the date/time selector is not greyed out #34
• Axes are now merged when they have the same min/max values. (Can be enabled/disabled in config) Merge Y axis of datapoints with the same range and unit #4
• Data Points Graph: trying to disable last data point breaks the widget #43

Proposed changes

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s)
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[jdre-c8y]

add an description what kind of bugs it fixes and what are improvements

[eniosultan]

add an description what kind of bugs it fixes and what are improvements

Added the ones which I could remember :>

[DawidSAG]

@eniosultan is this expected y axis label? I have to datapoints configured to have the same min/max values.

[DawidSAG]

If you have two datapoints (fresh dps in my case) and you decide to do the following:

1. Add min/max value in one of them => so dps appears on separate y axis,
2. Remove min/max value => dps are still separated.

I would assume that y axis should be merged once again.

[DawidSAG]

1. I have two dps, and when I hide one I can't make it visible anymore, (second dp does not have any fresh values).
2. Why I'm getting info, that my data may be out of sync, almost right away when widget is rendered? (I'm using simulator)
   https://github.com/user-attachments/assets/d54a0398-8354-432d-a247-0e65dc7fd857

[eniosultan]

1. I have two dps, and when I hide one I can't make it visible anymore, (second dp does not have any fresh values).
2. Why I'm getting info, that my data may be out of sync, almost right away when widget is rendered? (I'm using simulator)
   https://github.com/user-attachments/assets/d54a0398-8354-432d-a247-0e65dc7fd857

1. Is fixed
2. I havent changed logic for this one, not sure why this appears...