[IMPROVEMENT] use the switch --format for the dotnet-tools-outdated to receive the list of outdated tools as JSON or XML

[uo1]

Please confirm these before moving forward.

• I have searched for my feature proposal and have not found a work-in-progress/duplicate/resolved/discarded issue.
• This improvement refers to an existing feature. If you want to suggest a new feature, please use this template.
• This improvement is not a bug. If you want to report a bug, please use this template.

Describe the improvement

The dotnet-tools-outdated dotnet tool provides a switch --format, with that you can choose the format of the output.
The default is a table, but for machine processing it might be easier and more reliable to choose JSON or XML.

Describe how this improvement could help users

There is no immediate benefit for the end user, but it can make UniGetUI more reliable.
The JSON and XML formats also provides additional information that might be useful in the future.

[marticliment]

Yep, I definitelly will do this